Interesting discussion to follow about tuning.
After 50 years of racing, on and off road, on 2 and 4 wheels, I have seen that when it comes to faster lap times you have to do your changes and adjustments in the following order:
1 Driver
2 Driver
3 Driver
4 Rubber
5 Brakes and chassie
6 Engine

The other way around just cost a lot of money and breakdowns - Drive and have fun.
Looking forward to track meets on three wheels

Stig (not The Stig)