My problem is different from yours.
My rear slide extends about 9 inches after retracting.
Hwh says it is the solenoid control valve and I have replaced it 3 times, no joy. The last one they sent me leaks fluid too.
I found that opening the pressure release about 2 turns and the locking the slide in with lumber in the overhead works for me.
Maybe I will get to Hwh in Iowa eventually to get it fixed.
It is possible that loosening the Valve will help your problem.
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