Finally getting back around to dealing with this and had a couple questions, I'm feeling REAL nervous about torching my frame and I'm hoping someone can either talk me out of my anxiety or talk me out of a bad mistake. I'm hoping to add frame pump pegs to the bike (of the long bent prong kind not the short-stub-on-the-headtube kind) to the aft of the seat tube.

I have silver filler (56%) and also bronze filler (Gasflux C-04) available to me. I've been practicing and I'm fairly comfortable with both, but I'm worried that if I use the silver filler, I won't have enough of a fillet to support the peg (the lower peg is going above the derailleur on what is presumably a thin section of the butted tubing), and I'm worried with the bronze filler I'll overheat and screw up the tubing somehow.

Which filler would you use for the pegs? If I use bronze, how at-risk am I for overheating the frame and giving it the opportunity to crack somewhere?