Airsoft Canada - mag well grip?

Played my first game with my ares octarms km9 yesterday, I don't have a fore grip on it yet (first M4, was P90 before). I was originally thinking the fortis shift, I'm not full on vertical grip nor angled grip with the thumb over. I noticed I mostly played with my pinky and sometimes second finger on the mag, then the rest on the upper. It's the kind of grip the fortis shift allows, but way back at the mag well instead of part way up the barrel. My question is do the kind of mag grips that fit over the mag well or attach to the under barrel then have an off set grip in front of the mag well allow a kind of angle, or do they specifically cause more of a vertical hold? Maybe I should get the short angle shift and place it right in front of the mag well? I don't know if the full size shift would get in the way of the mag if it's placed back enough to where it would help with that kind of grip at the mag. Input is appreciated, thanks.