Getting it to become second nature!
Hey! Firstly I would advise not to add weight to your air tank as it will stress your asa and possibly break it.
The best way is to set your whole maker up - excluding paint, then stand just opposiste and off to the side of a mirror to practice your snap shooting, try to image all of the different bunker types, doritio's, stand-up, etc,. Mimic them using your reflection as a feedback to your shape.
Also use the whole gun setup as a weight switching sides and holding it out in front of you and to your side. Jogging on the spot perfecting holding your barrel straight during different running speeds, practice brining your gun up from break-outs.
Just a few techniques I used to practice and they helped me!
May have an indoors place to train soon, will let you know in PM.
Regards kR3ED