@Gazpy, couple things:
H-LotC isn't that good. Nearly any (minus ~maybe~ NM Wushoolay's) of the ToT trinkets are better and you're probably holding yourself back using it. This tier is all about RPPM trinkets, and while LotC's ICD makes its behavior more predictable, you'd get more mileage from a RPPM trinket. Secondly, imo, 4-set isn't that good. If you can get better itemized gear in other slots, I'd roll with that gear instead. If you can manage 535 double upgraded 4-piece w/ a H-TF off piece, that'd be a caveat as an alternative to, say, Ra-Den loot; but a few of our Tier 15 pieces are very poorly itemized (chest/hands) so go with whatever has the best itemization.
Also, SW: D should be used when it's available and definitely NOT only if DP is up. SW: D has a 6 second orb-generating CD, use this WA to track it:
Code:
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The purpose of this WA is to alert you when you can hit SW: D to generate an extra orb -- which is just 6 seconds -- while inside its normal 8-second CD (as apposed to double tapping it and using 2 GCDs...though keep in mind in 5.4 we'll be double tapping since that WA I just linked will be obsolete as they're raising the timeframe for gaining an orb from SW: D from 6 to 7.5 seconds). The benefit of this is that you'll be able to get more DPs up when in execute range. More DP = more SW:I = more overall DPS. After that, I'd suggest giving PI a shot for some of the fights you seem to be using DI. I like using PI for IQ, but that's a personal preference. PI and DI perform very similarly at higher gear levels, but using it, you can get some absolutely fucking ridiculous burst on pull with a UVLS-amped SW: P/VT/3Orb DP -> MF:I combo.