Ok. here's an idea seen as you have to renew your brake pipes.
1. Buy good fastroad pads, these work at higher temperature's & that would help with any fade.
2. Get braided brake hoses, this will mean the fluid will be pushing the piston harder.
3. Buy a good quality Dot 4 fluid & renew all fluid, including the clutch.
4. Replace the brake vacuam pipe.
If you want to go outboard, get a hydralic handbrake so you can keep the rear disc's. A brake bias adjuster would be a good idea, if you go an track regularly.
2x 145, 4x 75, 4x Sprints,a 156, 146 now a 155