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I’ve got the full F working ok, but not fast enough yet; so I’ve been experimenting with the mini versions. The way I cracked the FULL-F was to extend my first finger a good half inch over the fretboard, way past the 6th string, mainly because my finger is very fleshy until the first joint.
I experimented with Tony’s mini-F and same problem, too fleshy near the finger tip. So here’s what is now working for me, consistently: put down the middle and ring fingers, as arched as possible, and make sure they ring cleanly.
Now place down the index finger on it’s side, as comfortably you can bear, but EXTENDED across to the D-string. This isn’t a problem as you are already fingering the D and G further up the fretboard. Focus on getting all 4 high strings ringing cleanly before you strum.
You will increase the finger arch by easing the base of your thumb as close as possible to the fret body.
Hope this helps.