I may have missed this in the thread and as we haven't seen a picture of the right rear of your mech showing the area pictured here below,
does your mech have the anti-check payout assembly on it?
The portion circled here?
If so, point "A" should be up and point "B" should be in this forward position to allow correct vertical pay finger operation
interacting with the horizontal slide release levers allowing for proper payout from the payout slide assembly!
Just a random thought on my part!
MONTI