I think I have solved the ball spin-out problem when it drops down thru the wireform loops. It actually happens on both the left and (mostly) the right. I have still had this happen even though I put a rubber on the wire guide.
I was watching the ball carefully (no beer in me at all) while it dropped out of the loop.
The ball doesnt always spin out of the lane, defying gravity all the way into the golum lane and drain, every time. Only once in awhile and at the worst possible time. A fast running ball can have a huge spin on it.
If everything goes well, on a regular shot, the ball rolls down the wireform and rolls down the loop, bounces a little and then goes down the lane.
However if the ball rapidly circumscribes the ring before dropping, this puts a spin/rotation on the ball that makes it roll up and out of the lane.
My wireform "double" loops were not parallell to the PF. In fact they were hanging a bit low in the downhill side by about 3 degrees.
This angle made it easier for the ball to spin out of the lane as it was more in line the the balls rotation.
In order to counter the spin on the ball one must convert it to a lateral spin instead of an uphill spin, you have to bend the loop up a bit.
The goal is to have the "double" loop bent upward on the downhill side in relation to the PF angle.
The problem was how to do it easily without applying too much pressure on the form and ripping out any mounting screws, as you have to bend it at least 1/4"to 5/16" especially if the bend was negative (like mine) when you started.
I ended up hooking a 3/8 (or bigger) nut driver inside the lower "double" loop with the handle over the wireform side, pressing carefully until the nut driver handle was basically resting in upper part of the wireform itself. The bending of the double loop didnt break the welds or harm it as far as I can see, as I was being careful.
I actually did this on both the left and the right sides.
The upper single loop can also be bent up so that it matches cosmetically but its not really neccessary. (I just wedged a big screwdriver in and bent it up a bit so it looked level).
Kpg has mentioned in this thread that you can put a rubber on the wireguide in the lane. This actually works as it will brake the spin of the ball when it hits it, but for me it blocks the lane a bit, and its hard to get a tiny rubber that fits properly.
If the loop is bent up enough the problem is solved forever, as the ball spin will be lateral now instead of uphill.
I hope this helps anyone else with this problem. As always your milage may vary, its pinball.