Very good informative video. Watched a couple others of your's like the exhaust porting one. Looks like it may be time to step up to a bigger compressor. The air tools use quite a bit of cfm when in constant use. What size tank do you have, noticed when you started porting the speed dropped off quick and compressor kicked right on.
Thats why I don't do any porting at home, my tank is too small, now the compressor at work is a 120 gallon tank and our shop pressure is set at 155psi so constant use is no problem.