Any info on this shimming process from 115 bar? Is there a standard or given amt that gets you 135 bar?

Or involves trial & error then perhaps testing and or measuring?

As a rule of thumb each +0.10mm shim thickness will add about +100psi to the pop pressure. As you go past 2000psi, each 0.05mm adds 100psi. But it's trial and error. You need a pop tester to do this properly. It's also normal for injector to lose about 100 PSI pop pressure after about 20,000 miles.

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CENSORED due to not family friendly words