Nothing really to add to what's been said - hold consistency, use a glove, use naturally occurring rests
The one bit of HFT that I think robs it of the realism it offers that FT doesn't is shooting prone -but if you can, why wouldn't you!?!?!
A strong prone technique narrows the playing field between PCP and springer by taking away a lot of the weight difference
TX200 .177 21mm TL | TX200HC .22 22mm TL | Prosport .22 22mm TL
HW40 | HW45 | Diana Mod5 | Webley Senior....... Because PCP is like kissing your sister (apparently)