Keith,
are you you using your barcons in indexed or friction mode?
I ask because I recently disassembled my 7-sp indexing Command shifters to disable the indexing. The 'upgrade' has been a success, I think, but I kinda had the feeling I was fixing something that wasn't broken. Perhaps it was the derailleur I should have changed? (Cyclone Mk-II GT)
These are friction only... do not think one would have success using Suntour indexed shifters (or Shimano for that matter) with a SRAM because of the different actuation.