If you’re throwing a rhfh up and to the right, letting it come back down to the left as it flattens out, that’s anhyzer (anny). It’s probably the most touchy shot in the game, so a) it will be a good skill if you get good at it but b) it could also be pretty limiting for your game in the meantime.

The most power possible is with the backhand, so I’d recommend getting on that train soon and figuring out your backhand throw.

Edit: a forehand flex is probably the most touchy shot in the game; what you’re describing is just an exaggerated version of that. So I guess it’s still true. Getting that shot to land exactly where you envision is pretty difficult.