The glass is likely dirty. You might get a bit of brake cleaner with long spout for a short directed squirt and drain/evaporate to clean it.
Try 4psi in the back and 5 in the front and experiments from there. Low pressure gauge will give you a better reading than one expected to be accurate at normal pressures.
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'07 EC300 GG
14 TXT250 GG
07 Beta Rev3
496 CPI Cheetah RZ/RGV hybrid
765 Street Triple RS
'21 XTrainer
Stinger T125 Suzuki
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