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Proportioning valves are ONLY supposed to be on the rear. Generally you want to raise the performance in back to match the front. I dont think the pre 84 cars had a pressure limiting valve on the rear that you can remove.
I had an issue like you describe when my corner balance was off. I suspect you have a balance issue. Tires not matched or sized wrong, worn or mismatched shocks, Corner wieight off, worn bushings, sagged T bar etc. etc. can all play a role.
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erik.lombard@gmail.com
1994 Lotus Esprit S4 - interesting!
84 lime green back date (LWB 911R) SOLD 
RSR look hot rod, based on 75' SOLD
73 911t 3.0SC Hot rod Gulf Blue - Sold.
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