I use sp v2.0 pro with 205_g software, max esc timing and middle timing for motor on speed passion v3 4.5t with 7.9fdr. With a fan blowing, no heatsink the motor gets to around 50 deg. celcius after 5 minutes.
I'm going to play with that software on the weekend, my friend told me that 518mod doesn't have much timing. Last time I race on a track with around a 70m long straight I used 422 stock instead as that gave more timing. I watch video of trc track and i don't think you would gain much by running 518mod software, just run 205. With 4t just run 8.9fdr, drrs=whatever you feel comfortable with and max amts.