The best grip allow you to place the pad of your index/trigger finger/booger hook on the face of the trigger shoe forming a 90* angle at the second knuckle with the 3rd knuckle straight and finger parallel to the trigger. I'm 6'5" with larger hands and the McMillan A5 allows me to do this perfectly if my hand placement is consistent on the palm swell. I'm unfamiliar with exactly what style stock is on the 12FV, but I would imagine a simple adjustment to your hand placement would make a large difference.
The reason for the 90* at the second knuckle is because the trigger finger will pull straight back more consistently in this format, but it takes practice and getting used too in order to develop the motor skill. I'll post a few pictures and maybe a video of what I'm trying to explain when I get home from work, but you can see roughly what I'm referring to in my avatar picture if you're observing the forum on a large enough screen.
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