Waveblaster jetting and pop off

Location
US
I have a Waveblaster 1 with Riva red pipe, Ada girdled head with 35cc domes and a mikuni sbn 44. Question is for pop off pressure. Jetting is 120 low and 145 high with a 2.3 needle. What spring and pop off pressure should I be at?

Thanks guys!

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