Difficulty getting the tow ball to release from hitch

OT a little but I'm using a Blue Ox WDH. The ball sits vertical because the spring bar angle is cast into the head. Very few issues with releasing. I'm thinking that the vertical ball puts less pressure on that flapper thing in the coupler.
BTDT with an EQ and an EAZ-Lift.

Used to have issue fairly often with tilted head units. Usually just putting the truck in D and easing forward released everything.