3 ball - default setup except for 7 second ball save and extra ball for special/replay. Originally I also had it set at 6.5 degrees and within 3 months had achieved SOTR 3 or 4 times and been close handful of other times. With this lower angle I really learned the game and focused on ball control. Now I've jacked up the angle to 8 degrees and I've got to improve my game for speed/reflexes, etc. Best I've done so far is 3 jewels.

To Start Melt the Witch you need to
Start ECMB
Start Rescue MB
Start a Munchkin Mode
Start Fireball Frenzy (by completing 3 witch hurry-ups and then starting another)
Then the big green insert below the witch will be lit and hitting her will start the mode which is a 2 ball multiball.

To then Melt the Witch you need to keep two balls in play and complete 4 shots (left VUK via spinner, left orbit, right orbit, wizard saucer - you can do all 4 separately or any mix of these (e.g. two orbits and two saucers)). Then you need to lock a ball in the castle VUK and while that is held shoot the other ball up the ramp where it goes around the house and drops in front of the upper flipper and you need to then hit the witch... and she is melted.

Then you get your award of Ding Dong the Witch is Dead multiball.

Personally I do go for the witch hurry-ups with my skill shots but then I actually ignore lighting ECMB locks (they just happen while I'm playing) and I try to get hurry-ups and YBRs... and when winkie is down (from the hurry up) I go for the castle to light rescue (as many times as I can so I have more balls during that multiball (though if speed is your goal only spell it 1x)). During the course of that RAINBOW gets spelled so I get my munchkin mode and the other MBs are qualified, locked, or achieved already so I'm good to go for the witch.