I'm about 5'7" 140ish.
For a good sport seat in a street car (not a true race seat), Cobreau makes some good ones that I have been very happy with. The A4 was narrower than the CR1 with lots of support if you want a seat that reclines. If you are ok with a fixed back, the Forza held me well. I'd do the A4 again in my next project.
1998 Roush: M112'd Aluminum block 4.6L 2V 6 speed track car
1999 SVT: Mostly stockish
1970 Mach 1: Resto-modded monster
2000 Roush #5004 - World's FIRST M112'd V6 Mustang. Sold, but not forgotten.