20 times? Well, from the experience I had doing the same thing, you're almost there.

Are you having door open/close problems or door switch problems? Maybe both? I did learn that the door switches need to be the switches with green plungers. Apparently there are different force requirements for the microswitch plungers. I had red plunger switches in there and fought them constantly. Put some used switches in there that had green plungers and they worked great. As far as the door springs, that was trial and error of cutting and stretching springs. Maybe get some new ones from JJP and start over with them.

User error

That's helpful...

I owned a Wizard of Oz Pin (NIB) for two and a half of years. We enjoyed playing it but it seemed that every couple of weeks or so something would go wrong - mostly minor things. A few of the more serious issues I had to call a JJP representative and get advice on how to fix. Many owners were writing pinside about their problems. Finally, I must say, I lost my nerve and sold it before something went wrong that I would be unable to fix. No pinball repairman within 100 miles. IMO this pin has too many bells and whistles. I currently own a "The Beatles" Gold machine and enjoy it much more.

April fools??

Don't give up mang. I have never had to adjust my switches so my advice could be wrong but you should be able to listen and hear the switches being activated and know they are adjusted properly before putting the playfield back on. They need to be able to register within the small amount of movement the doors have but not so sensitive that they will activate under a little vibration. I know that window is small but it can be done.