I’ve driven TAG with front brakes for 1 season (32mm Swiss) and then 2 seasons with rear-only brakes (Tony 32mm). Front brakes had a 20 lb penalty, and was winning at AMP. TS decided to ban fronts mid-season just before their big money race, didn’t bother to go. Next season started with rear-only. Lap times were faster without the 20 lb penalty obviously, but we tested adding and removing weight with rears only, and was faster overall without rears. Just need to get used to it. Only downside is you change pads more often with rear-only.