Silver soldering issues

I want to repair some small Mopar parts by silver soldering them back together where they broke. I have no problem melting the silver solder on the work and getting it to flow (using white brazing flux) when using an oxy-acetylene torch with the smallest tip I've got ("00") and the flame adjusted as small as possible, but it's too hot and tends to burn or scorch the work. My buddies told me I should use a butane mini-torch instead. However, the butane mini-torch flame doesn't seem to be hot enough to melt the solder.

Can anybody suggest what I might be doing wrong? Thanks a lot.