Tactical Trijicon ACOG TA01 Style 4x32 Cross Sight Rifle Scope + Kill Flash
TROBB Solid Aluminium Dovetail Power Block with Gmac hollow probe and G-mac Bolt
Gmac Brass Power Adjuster Spring And Guide/Drilled Out Standard Valve For more air space
Hammer Mods//Gmac 30% Lighter valve Spring/Gmac Brass Safety Catch//Transfer port drilled out
Full Gmac Trigger kit/Gmac barrel cut to 9inch/Weihrauch Silencer/Custom Home Made Grips/
New TRACER LEDRAY GL2 LAMP 90m Range Beam//HI-Pac
have you replaced the trigger spring? A lighter one will make a significant difference. It does help me if I really wrap my hand around the grips - taking out all the slack. Then concentrate on holding the gun (like you say) between middle finger and thumb. I've also found that concentrating on the front sight helps - that's all that needs to be in focus - you can't focus on three different things at three different distances at once, so don't even try.
Disclaimer: most of my pistol shooting is for pistol FT from a modified Creedmoor position.