Just looked at minisport, a new spring is about $6, maybe talk to them.

Do you have access to a mechanical gauge? Will save a lot of chasing your tail. Maybe even try putting compressed air on the sender.

What 20W/50 oil are you running, some brands lose a heap of pressure when good and hot. I found Castrol GTX the worst- and Valvoline Classic, or Gulf Western very good.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I'm using penrite