I have 2 rt classics(well 3 actually but one is still new in the box and staying that way) and neither one will rt on 850psi. just how much pressure is needed to get them to rt reasonably well? I have a 1200 psi coming but want to save it for special occasions plus I can waste enough paint on semi only but it would be nice to be able to get them to rt once in a while without needing that much pressure. also anyone have an idea on about how many shots you can get out of a 68/4500 tank in the 850 psi and higher pressures?