I assume you're positive that the lines are completely thawed of any residual moisture. Which shouldn't exist because of your thorough winteriziing.
So the only thing I can think of is debris trapped in the faucet screen. Have you tried removing them? The mesh is so fine that it doesn't take much grit to reduce the flow to a trickle.
__________________
Jim
2018 Cougar 32RLI
Hercules H-901 tires
CRE3000 w/wet bolts
2021 F-350 4x4 7.3L Godzilla Crew Cab
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