That means you're trying to adjust cracking effort with the orifice. The resultant change in purge flow is a function of lever height, and that "insipid" breathing at depth could end up being dangerous if lever excursion is limited by the drop.
Much better to shim the poppet spring. Or use the knob as you describe.
Much better to shim the poppet spring. Or use the knob as you describe.
