Huh? You fish big poppers on a 2 wt? I'm not a native english speaker so i might understand things wrong. I'd think you adapt the line size to the fly size (weight, air resistance etc.) so in the end when the leader is correct for the line size i't also correct for the fly size.
Karel
PS, fun to see you guys here also. Seen the C-channel and window latch picture, seems the way to go to extend my current board on the butt side without having to use extra T-track(of which my supply is dried out).