In my opinion, the game needs consistency, as it's the only way players can make informed decisions. If you just flat-out say "no, you can't do that flip you did last time" or "you can do the flip, but that bonus was special and you won't get it again" because the effect is broken, that feels arbitrary and unhinges them from the game world. You need to explain things at a player level here --- "yeah, sorry, I winged a ruling and think the effect is too powerful in retrospect, let's try to find something that seems like a better consistent ruling, and say that one time you just got lucky" or something.
Frankly a lot of your issues sound like communication issues, not system issues, but this one in particular strikes me: you have to accept that both you and the player are people trying to enjoy this game, and talk.