XRAY - Model racing cars

Im running this combo in 13.5 boosted but it seem to be down on power. Im running a 27.5mm rollout, 44 boost, 5000 start rpm, 400acc, turbo 20, delay 0.3. end bell timing on 15. Have anyone used this combo? Can anyone please give suggestions on how I can get the best out of this combo?

Thanks

No experience of that system but looks like start rpm is high, I started using boost on a Hobbywing the same and found it snatchy so reduced delay, start rpm and acceleration rate till it was smooth then just gear up/down to suit the track