bias has a lot more to do with other things than rotor diameter. piston diameter plays a big role.....id hit up some online calcs to check it out. likely fine but id want to make sure.
you come from audi/vw world where they try to find the biggest shit possible
and bolt it on . doesnt mean better braking or modulation compared to a 4 or 6 piston set up. just more bling really at the end of the day. Which is fine ..just as long as you realize that
really you can only break as hard as you have grip. if you can over come your grip easily than its doing you no good. more heat soak helps too but even oem brakes dont have that issue typically on e36 m...(i know you have a 328 baller turbo )