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If the pickup is as low as it can get, continuing to turn the height adjustment screws strips the threads into which they are biting.
As you turn the screws anti-clockwise, the compressible rubber pad beneath the P90 will push it closer to the strings. If the rubber is already fully compressed, it might take a while to recover its proper shape.
You might try gently lifting the soapbar with your fingers as you loosen the height screws - the cover may be tight in the cutout and binding slightly. This may allow the foam (if present) to expand slowly.
Sometimes the side walls or corners of the pickup casing flare out very slightly at the bottom edge and can then bind on the cavity walls if it is routed tight.
As others have mentioned, rubber pads and/or timber shims are normally used. Springs or latex tubing work but can make the pickup wobble slightly. A similar principal applies to mounting FilterTron type pickups. Admittedly it's a little tedious compared to humbucker mounting but it only usually needs doing once.