[Uncle]

So I've maxed out the adjustable WUR and have cranked up the fuel pressure as far as I dare (10.2@1,000rpm) but still need more fuel at 5500+ rpm. AFR gauge is telling me 12.5 at 5,500 and 13+ to 6.500rpm.
The right balance for the CSV seems to be 4200rpm with full boost coming on at bang on 3000rpm.
Everything else is just fine but I just can't get enough fuel a higher RPM.

Am I missing something or is the answer a modded fuel head? I'm good with EFI but CIS is still new to me.


Specs are,
87 3.3ltr
K27.
Fabspeed headers with Zork tube.
B.L WUR.
Andial Cooler.
1 bar spring.
K&N Filter on the metering plate.
100RON fuel.