Bootshine is worth using in the normal rotation every other time. Dragon Kick lasts long enough that, barring any interruptions from the boss (titan's leap, garuda's teleport, etc.) or you having to stop your rotation to reapply Fracture or Touch of Death, you can use it without having the Dragon Kick debuff fall off before the next use.

Oh and yeah, Touch of Death and Demolish are worth using all the time, and Fracture is good when you have your buffs/debuff going (almost half of Fracture's damage is from the initial hit, which benefits from DKick, so make sure you have that up before using it.) Impulse Drive is a good skill to weave in from time to time, but its higher TP cost can become an issue in longer fights (Fracture has a similar issue, but to a lesser extent.)

Arm of the Destroyer is good for AoE situations when you can hit 4 targets or more and TP isn't an issue. One Ilm Punch is the only attack you never really use.

And of course, Steel Peak (if the boss doesn't need to be stunned, otherwise you'll screw with the diminishing returns timer) and Howling Fist (save for AoE if needed/helpful, like Garuda's plumes during the first part).