Maybe its how you incorporate your lats, I'm sure you guys know I am new to powerlifting, been wasting 3 years bodybuilding, but I have always had a strong back which translated to a descent bench, anyway, when I bench I call on my lats to blast the bar from the very bottom until my chest then my tri's take over usually in that order, I just incorporate them into my lift and I feel they are the rocket fuel that helps to blast off the rocket (cheesy I know)
Thats my 2cents
Mike