I was getting this issue as well. I changed the Demon Lockup power and turned the head as far as I could clockwise (not much give) and was still getting SDTM. I then adjusted my front-to-back leveling to have the bubble touch the top line... still getting the issue. I played around with all of the adjustments until I settled on: Demon head as far clockwise as possible, factory settings for lockup and eject power, and front-to-back leveling with bubble touching top line... and now the balls all hit the tip of my left flipper with great consistency. My VUK in the demon head is also working properly now. I guess we'll see how long this lasts.

Also must say it's been a little easier to hit the right ramp and the right orbit as well since the fix.