what is your brake setup and what does it take to get your brakes to fade?

tonight i was out for a little spirited driving and i decided to test my brakes a bit. in the past i've tested the brakes and established that my brakes can generate enough stopping force to lock up the front tires at pretty much any speed (i have no ABS) and i can brake from 100mph to 0mph at or near the threshold of the tires without any noticeable fade. tonight i did runs braking at or about tire threshold from 70-80mph down to 10mph, immediately accelerating back up to 70-80 and repeating. on the fourth run i started to notice some brake fade. i've never tried this before and i was kinda suprised that it took so little to get my brakes to fade.

i'm running Stillen cross drilled rotors in the stock 16v size, Jurid pads in stock 16v calipers, SS brake lines, and ATE Blue fluid. it's been two years since i've flushed the fluid. i guess i need to flush with Motul 600 this time.

does anyone have any similar experiences? is it normal for a 16v with these performance brake parts to experience this brake fade so quickly?

does anyone have experience with a brake proportioning valve to dial a little more force to the rears? my fronts will lock up way before my rears. i'm thinking about purchasing one and having my mechic install it as i'm not confident in my tube cutting, flaring, and bending skills.

thanks,

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dew
86' 190e 2.3L 16v