Answer to question #1 - Yes. Answer to question #2 - Yes.

I'm surprised you're getting reliable ignition with T7. But, if it works for you (i.e. goes off every time with no ignition delay) then go for it. I've used only GOEX in my Great Plains - FFFg in the bore and the pan. I alsohave an RMCvent liner, andhave yet to have a misfire. I've had the pan fail to flash a few times, but if the pan flashes the gun goes boom. My longest flint life with Fuller black English flints is a little over 80 shots. Average is something between 40 and60.Might have to try T7 just for grins.