for really big kicks youneed to be layering samples on top of each other. sometimes i layer 3 or 4. all picked out for their own specific purposes, ie: i like the mid in one, the sub in another.

to make a kick cut thru the low end on a mix you need to be eqing properly. leaving room in the bass for the kick to sit etc. you also need to compress properly and not just for the sake of compressing.

another little trick is to add a touch of overdrive to the higher frequencies but leave the lower and sub frequencies untouched. the sparkle on top helps the attack push thru but the clean subs keep the weight intact.