The entry lock does look quite strong. From the pic the exit stone looks a little light too, but could be just fine. The thing is with the escapement you have to check everything- total lock is just one aspect.   Briefly, to check (mind you in school some weeks are spent on this): All checks done with balance in, some power on train rotate balance slowly and observe drop lock, it should be minimal and equal on both sides at the moment of drop, manipulate the fork to