No, if it builds pressure that quick means the system is full. 40 is a good feed pressure. I use my low pressure pump at 45-50 psi when I wash. I don't even use the hp pump during wash and rinse.
Have you been able to increase your overall pressure yet?
600 taps on vacuum
Lapierre mechanical Releaser
CDL electric releaser
2.5 x 10 CDL Venturi ( new for the 2024 season )
Home made modulating auto draw off
Homemade RO 2 x 4" membranes
CDL 16 x 16 bottler
Wesfab 7" filter press
Delaval 73 vacuum pumps
12 hives of bees