As someone who has leveled from 100 to 110 as affliction I must tell you, if you decide to go with a tank pet ( VW or infernal ) you can pretty much mass pull by the dozen , no joke.
Although I must tell you burning rush isn't rly needed, not many situations where you need to move much while in combat ( and out of combat you're pretty much mounted as most zones are outdoor lvling ), I would very much advise you to get dark pact , it has saved my life from the occasional over pull.
As for your first row of talents, I've tried all 3 and I honestly feel like any of those work , writhe is nice but usually normal mobs don't last long enough for it to hit the 20th stack, and haunt has nice burst but has a cd which resets on kills, which is fine rly, and drain soul I found is just better sustained though I feel most comfortable playing drain soul while leveling simply because of the fact that gives you a shard when u kill something while draining, this means with mass pulls you are always full on shards and you can chain cast UAs repeatedly which simply destroys mobs.
Absolute corr is fine but you dont benefit from the full duration , unless you are going to SoC a group of mobs which is a viable way for mass pulling, though I found that you cannot always mass pull as mobs are too far apart, and given the above about drain soul and shard income you can keep UA up well enough, so contagion is rather decent too, but down to preference rly.
Supremacy is the way for leveling that's for sure.
Last row, don't bother with effigy for leveling, trust me it's clunky and annoying and most of the time you won't even need it, I found shards flow in quite well with drain soul so I don't even need conduit which left with me phantom singularity, which isn't that bad tbh, when you mass pull mobs , throw in a few seeds into phantom then proceed to tab dot everything and you'll be shredding through those mobs so fast it's not even funny.
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SirreASDF Please read what I wrote again, I didn't say it procs every 40 secs. I said it procs more than once per 40 secs or so it seems.
I've had times where I've had 5 procced souls in arena within the first minute and other times where I've had 8 within the same period, sometimes it's less than 3 so I don't rly know how frequently it's proccing but I can assure you that every time you build enough shards to spam UA you will be able to use soul reap for the entire duration of the UA dump.