Having used Rampardos before, there's really no reason to use Head Smash on the LO sets (Rock Polish & Trick Room). The power is nice, but the 50% recoil and 80% accuracy really makes for an inconsistent strategy. Add that with LO recoil and Rampardos's sweep would halt unexpectedly.
With Rock Slide being boosted to the level of Stone Edge (but with better accuracy) and FREE LO-boost, is there any reason to NOT use the more consistent and sufficiently powerful Rock Slide over the suicidal & overkill Head Smash?
Basically Rock Slide should be a keeper on those sets; switch places of Rock Slide and Head Smash.