So, let's start with a comparison between yourself and your bear tank. If your healers say that he is easier to heal, that might be the case. The easiest way to check is to look at the spikiness of each tank.
Your health over time
Your bear tank's health over time
Just a quick comparison shows that you're spikier. You have 4-5 points where you go from 100% to sub 25% in relatively short time. Whereas, your bear tank only has one such point and is regularly above 50% HP. This is why your healers think that you're harder to heal.
Additionally, Warriors are generally considered the least spikey tanks. All of our mitigation is proactive (Shield Block and Ignore Pain), which means that it should prevent the hit from getting us low. Unlike DKs/Paladins/Demon Hunters that have reactive healing that allows them to recover from low HP. Warriors do not have an ability to recover from low HP and that puts stress on your healers.
Next step is to look at why you're wiping. If you're asking for help on logs it's probably because you died a lot on your attempts.
All your deaths to Xavius
The first thing that jumps out to me is that you died to Xavius' melee 5 times, which is an incredible amount. Let's follow this train of thought and see why this is the case. The first place i'd look is a breakdown of your total damage taken from Xavius on a fight.
Here's your logs
Comparison to a good tank's log
You took a lot more melee damage from the boss. 51% of your total damage taken versus 45% of Clutch's damage. And your average melee hit was 580k, while Clutch's was 510k. Most importantly, the largest melee you took from Xavius was 1.8 million. Clutch on the other hand only took 1.3 million as the largest melee hit (all of this information is found out by mousing over the melee damage taken numbers).
Most likely culprit for all of those problems is Shield Block uptime. So, lets take a look.
Your defensive buff uptime
Clutch's defensive buff uptime
Your Shield Block uptime is horrible (Scroll down to defensive buffs and look for Shield Block). You cast Shield Block 1 time the entire fight and it's not much better on the rest of your pulls. I know what you're thinking, "but Eman Ignore Pain is so amazing. Why should I ever press Shield Block?" The answer to this question is that Shield Block costs 10 freaking rage.
10 freaking rage. That's basically nothing. You should always be prioritizing Shield Block over Ignore Pain because it's so cheap. Shield Block will always prevent more damage per rage spent than Ignore Pain as long as the boss is melee-ing you.
Clutch on the other hand is a god. His up-time on Shield Block is 83%, which is about as good as you're going to get. Clutch really focuses on his Shield Block up-time and takes very little melee damage. 83% is something that you're not going to hit instantly, but you can definitely go for 50-70% and see a lot of improvement.
Next thing that you die the most to is the dot that Xavius puts on you. Lets see if you're casting Spell Reflection to counter that.
All your casts on your Xavius kill
You don't cast Spell Reflection once (Note: We already knew this from the defensive buffs tab). Spell Reflection does not cost you rage and has a 24 second cooldown. It reduces your magic damage taken by 30% while it is up (5 seconds). There is no reason to not be using this spell. I understand that some people may not be used to the new Spell Reflect, but you need to start using it against magic damage.
While we're looking at all of your casts lets talk about a few other things. These are common problems for new/in-experienced players that aren't used to maximizing their GCDs.
1) Shield Slam casts are too low. Not accounting for resets or your haste level, you should have cast 53 shield slams (Fight Length / Shield Slam CD). Realistically, I would expect 60-65 casts for your fight length and haste level. You only cast 50, which hurts your rage generation.
2) Overall ability usage is low. For your fight length there are 318 GCDs (Fight Length / 1.5s GCD) not accounting for haste. You only used 260 abilities that required a GCD. This is really hurting your damage, rage generation, and overall survivability.
While we're talking about rage generation lets look at yours.
Rage generation on Xavius kill
I actually didn't know that it was possible to cap rage on a warrior. Somehow you managed to have wasted rage. Again, this just means that you're not pressing rage spending abilities in a timely manner (Focused Rage/Shield Block/Ignore Pain). You should never cap rage as a Warrior and it's oftentimes hard to be above 80 rage.
All this leads me to your armory.
Armory
We're not going to discuss which stat I think is better between Haste and Versatility. It's simply not important for this discussion. However, given the information i've talked about above and your GCD usage you should not be gearing/enchanting for Haste. Haste is a stat that rewards players for using their GCDs perfectly and optimizes Shield Block up-time. If you are not using Shield Block perfectly and maximizing your GCDs then Haste is not the stat for you.
Versatility, on the other hand, is a stat that just sits there and works. You don't have to play well, you don't have to use your GCDs, you don't have to press Shield Block. Versatility is a great stat for you.