Power break
Well, first off, i would like to say... hats off to those that can crush the rack and keep control!!!
I am what most would call a very large man LOL. I am 6 foot 5, and hover around 260lbs. I have played around with the break for several years, and have tried just about every "method" there is out there as it comes to addressing the rack on the break. I spent a little bit of time with Hillbilly at a fast eddie's tour stop in Round Rock, TX a few years ago, and he walked me through some steps to assist in my break.
So after many hours of attempting to perfect the "hillbilly break", i came to what i find to be the peak of my ability to impart energy into the cueball. As it turns out this equated to 31.4mph, and i was able to achieve this speed 3 out of 10 times being speed checked. 9 out of the 10 were all over 30mph.
HOWEVER... I have found that i have MUCH better results if i focus on SOLID contact with the one ball, and reign the break in to at or around the 22mph mark. This is where i try to keep my break 95% of the time.
If i run into the issue of the rack that "collapses on itself" (where the balls scatter like scaulded dogs, but then recluster), i then dial my break back even further down into the 15-18mph range and switching from solid contact, to the cut break.
Just my $.02, but i would much rather consistantly make ONE ball, and have a chance at getting out, rather than making 3 or 4 balls and not having a freaking CLUE where the rest of the balls may end up.