On an Axe that runs below 200 psi the tank output can fluctuate greatly and as long as the gun's regulator is working fine you wouldn't notice it.
Remember, regs can only reduce pressure. so 4500 psi in tank -> 600 psi out tank reg -> 200 psi out gun's reg.
Now if the tank's reg fluctuates for some technical reason, say 4500-> 400 to 600 -> still 200 psi out the gun's reg, assuming the gun's reg still work right. You might get a little change in output with big swings on input, but not like you are describing.
It might be you're not actually getting "creep", but more of a "shoot down" issue, where something is choking the flow along the path. ASA type, improperly installed hoses, something stuck in the fittings, that kind of stuff might cause that. As well in improperly lubed regs.
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David Johnson, AKA Fubarius.
Nunquam emere possis quae facitis
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