Maybe there is a thread\post about this out already, feel free to delete this if necessary. Thanks to the devs for implementing this feature! Can't wait to see even more improvements to the game.

My setup includes GC controller using Wii U adapter and vJoy. Also i've tried using a PS4 controller with and without input mapper.

The controller support for SSF2 Beta is a bit odd in my experience. The analog stick and c-stick setup specifically makes it really hard to consistently do up-airs\up-tilts and down-airs\down-tilts. From my SSB4 and minor SSBM experience, I think the analog stick map area for up\down tilts\airs takes up much less space in SSF2 then SSB's. Or perhaps the shape of it is different.

Furthermore, there seems to be issue with trying choose a throw direction. I generally have trouble getting the one I want. it usually does a down-throw or up-throw without me sometimes making a analog stick movement after the grab. I don't know why this is happening. Maybe it has to do with the analog stick mapping for grabs or maybe it's using the last input from the analog stick when the grab hits. I would have to check exactly how they implemented grabs in SSB's, as perhaps the grab algorithm waits for a second until it allows the player to choose a throw or it does something else.

Just a couple disclaimers, this may be just my personal preference or perhaps a user error on my side causing my issue. Thanks taking a look at this regardless.

The setting "radius" is the size of your control stick, maybe try tweaking that