Olympic Power Lifting (C&J, Snatch) is primarily velocity based. Competitive Weight Lifting (bench, squat, deads) is primarily strength based. The training strategies are different and the workout routines are different, so which one are you referring to and I'll try to offer some advice.
NSCA - CSCS
i don't know about how the typical powerlifter eats. but i am a powerlifter and this is how i eat (this should like you straight to the post with the diet rundown):
Kabuki's "VIDEO" Log - a little crazy fun for everyone
I would do some research on training on
Westside Barbell®"Often Imitated but never duplicated"
EliteFTS - Powerlifting and Strength Training Products and Knowledge for Lifters, Athletes, Coaches, and Trainers
Both sites also have a huge selection of books as well that you can order.
You can view sample programs and video's of lifts on my log as well.
1010 Squat @ 220 (#1 ranking in world) 801 Dead @ 198 (#1 ranking in world)
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Live Your DREAMS -> WWW . KABUKIWARRIOR . COM
The weight you use on a "normal" basis should be heavy enough to fail around 5 reps, and you would train in the 1-3 rep range on heavy days.
NSCA - CSCS