its a good chance it has a bit to do with the ECS settings i was having problems also with the 323 software with SP, i dont know much about the Tekin but i have been playing around with the speedy settings and now the car is fast and temps have come down also with the 323 software i run.
Since i have got the settings close i have now reduced my FDR from 6.5 to 5.5 and the MMM pulls hard with heaps of speed and the timing is set to 12 degrees
how big is your track? and i would defiantly start with Esc settings i can now run for 6m30 and my temps are at 78 degrees