Spline for falloff - have you tried that?

[knacki]

It’s quite some fun with dynamic radius.

Together with snap radius to apply it multiple times on same place you can achieve cool stuff.

EDIT
Together with alpha it is one stroke fun!

[Bezzo]

Wow. I had seen the addition of spline curve but didn’t pay it too much attention!! Thats awesome.

[knacki]

Together with paint