Ah yes when I did the 340 pump originally I also saw the very large idle spikes. Drilling out of the canister fill venturi to just over 100 thousandths brought it down somewhere into the 50s which was good enough for me.
S1 system will help promote a healthy curve as you go up in power/boost... but the current idle pressure spike you have is a side effect of the pump and the fix for that is unrelated to the RFS upgrade. The RFS will still run the venturi's so the venturi flow has to be opened up a little to fix that idle spike.
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