I'm relatively sure your power supply is fine. I've got the same thing going on with my creature and periodically I need to make mechanical adjustments to either/both the VUK under the PF or the position of the wire form to get it to work again. I'd suggest using a phone to take a video of the issue in SLO-MO (on the iPhone anyway) which has a high frame rate (240 fps). This will allow you to see if the trajectory of the ball causes it to glance off the wire and "rattle" around in the form causing it to loose energy and fail to complete the launch. The wire form should obviously guide the ball around the curve gently changing it's direction.

That being said my wire form is also F'd up. It broke and was welded back together, poorly I might add. (Anyone have one for sale?) Something I'll have to deal with when I get to a complete tear down.

I'm not quite sure I understand the adjustment you made but if it improved then that's a start. I'd still suggest using the video footage to help with understanding the ball's behavior when in the wire form.

In my situation I had to adjust such that the ball contacted the outer "wall" of the wire form earlier in it's upward trajectory. Since it curls toward the top of the playfield I had to move it up toward the bumpers. The ball is now effectively traveling parallel to the wire and right next to it. Thus when the ball finally makes contact with the wire form it's change of direction is more gradual (like a loop shot) rather than banging into the corner. I.e. - It's angle of incidence is much greater.