I had a look at the SP site in their 'setups' section. For a large track they recommend 6.3-6.5 FDR for 17.5 boosted.... Thats one slow car! I use 6.0 on small tracks... Been down under 5.0 for larger tracks.
Is their software the same? Seems it may have more timing (Despite the same number of STEPS) available based on these FDR's