I've only raced there once, but if you post this question in the Xray T1FK05 thread
all of the XRAY drivers that race there will be able to help. Here is the gearing I ran with a 19t CAMPro2 motor:
Here are a few setups from there:
Keith Trapp aka kt racing
As you can see, we all had different gearing, but we all ran different 19t motors as well.