I'm going to disagree here.
There ARE benefits to regulating CO2, in all but VERY rare instances. That's not regulating ALOT, but regulating is worthwhile. The trick is the RIGHT regulator.
The palmers reg, along with the aka LONG sidewinder, not only provide a more consistent flow of gas, CO2 almost never drops below 400 and spikes become irrelevant, they act as expansion chambers due to the way in which the gas moves past the reg seat.
Contrary to popular opinion, CO2 will not damage a properly maintained reg. They've been running on cockers for years that way....it's mostly propaganda and people refusing to lubricate regs the right way.
CO2 is far from the inferior gas source. Not only does it provide MORE shots per CI of tank on gun, it's safer to work with,and cheaper(because it's so readily available). The great flaw of CO2 is that it's dirty, and manufacturers have abandoned the more durable designs and solenoids needed to properly use the gas. CORRECTLY setup, Most mechanical or electro mechanical(ie guns not using a pneumatic flow-thru noid) guns are better off using CO2 with a purpose built reg(the palmer regs where MADE for that. They're not the hottest looking things, but they're the best in this application, no questions) just for the much larger in-tank capacity and simplicity.
HPA is NOT necessary on the gun you have. It will work fine,but is an awful waste. The tippman should be fully functional on a an anti-siphon tank with little to no velocity spikes...