I heard the same issues regarding HPA but I didn't run into those problems myself. Not sure what's different between my stock TiPX (and others) with the ones that are inconsistent. Maybe it's HP vs LP regs on the tanks? Not sure.
Regarding the extra shots when the remote line is disconnected, it'll hold it's charge when your remote adapter has the check valve installed but it will degas if it's not in there. Just FYI if you try FreeEnterprise's tip