I can not tuck my feet under the bench[/quote]
Why? Are you simulating lifting in a fed that requires the whole foot on the ground? Unless you plan on actually competing in that fed bench how you want to, because there are feds that allow the heel to be raised.
Once you feet are set up, however it is that you chose to go from here, Squeeze your glutes hard, as if you were trying to hold your guts in ( that’s as polite / less graphic as I can come up with at the moment, sorry)“hug” the bench with your thighs and squeeze those glutes, while pressing the heel to the floor. This will be likely be very uncomfortable.
YES!,YES!,YES! there is so much going on with a lift and while you’ll be thinking about one aspect, 5 more will be FUBAR. Record yourself. It will be very telling.
EDIT - Leg drive, while important, isn’t “magical”. All it does is serve to make your whole body rigid, therefore maximizing the potential to press more. Similar to jumping on a hard surface vs jumping in sand. does this make sense? [/quote]
Yeah, I understand what you mean. It’s probably as Ecchastang wrote, I used to allways bump my weight up with help of my torso, but now I’m actually " pressing " the weight so it just so much harder. Concerning the leg drive, at the moment I don’t feel any drive at all, I might as well just put my legs up on the bench, zero effect.