People often talk about "keeping constant pressure on the rail" when going
through a jibe. I learned the hard way what that meant and how important
it is to making a good jibe. You need to keep the amount of foot
pressure you're putting on the rail even. If you want to stomp, that's
fine as long as you don't stomp and then ease off because the board will
squirrel away underneath you. Likewise don't be tentative with the
pressure at first and then decide you want to increase it because that
will make you lose control too.
I sort of run through a checklist. Board speed good, check. Good patch
of water to jibe on, check. Unhook (can't tell you how many times I've
Foot out, apply pressure. Knees bent. Weight forward. Etc.