I have the exact same problem with a Sony Playstation IR Emitter (PS3IR-1000) as well as a DTV HR20-700 when using the Scoreguide. T2+ works perfectly and T2C sends double commands and both are using the same exact commands. If you turn off sustain then scrolling through the Playstation Store sucks cause you can only do it 1 at a time.

The other thing I notice is that the signal light on the RP6 stays on much longer when receiving the same command from a T2C vs. a T2+.

It should work the same for both as the commands are stored on the RP6 and the remotes are sending the trigger. I've tried everything including putting the commands as a system macro and using repeats. It kinda works but scrolling on the Playstation still sucks with the T2C.