304l stainless exhaust tig welding questions

[presure2]

Hey guys, getting settled in with my power pro 205, got a buddy coming by tommorow so I can set him up with an exhaust b-pipe, that will incorporate an electric cutout.
Here is a pic of one I made for a friend a couple years ago using my 110v mig machine, to give you an idea of what im going to be doing.





It will be fabricated out of 3" 304 stainless mandrel bends, and 3 bolt, 3/8" stainless flanges, and will incorporate the same style cutout that's in the pics above.

I ran a couple beads tonight, as practice, I have some dolor flux arriving tommorow to use on the inside of the joints.
Will have 1/16th and 3/32" lanth. Tungsten available, started off with ~ 50 amps without filler on some butt joints that seemed to go well, filler (using 308l 1/16 filler) needs help. Lol
Anyway, wondering if you guys could help with cup size and gas flow settings, and also maybe some suggestions on amp settings for welding to the flanges? (tubes are .065 wall)

Thanks in advance!
Manny