Are you waiting on parts to fix your issue? Disabling locks may make the game smoother, but your scores will go down. The subway is about the only place on the playfield where you can 'park' a ball during multiball. The time it takes for balls to cycle through is time you can spend shooting for jackpots with less balls in play. On games with upper flippers, parking a ball is very strategic.

If this game is used in a league or competition, the locks absolutely should be enabled.

You're probably right (don't own one), but Portal locks are definitely ejected from the subway during MB and it takes a good amount of time to get two balls cycled through. You don't want to lose that time.

Obviously anyone can do what they want with their game, but you don't want to make changes that will decrease your scores.

As I said above, when a mode is started with balls in the subway, it takes a significant amount of time for those balls to be put into play. You're briefly playing a one ball MB until the other balls are cycled through.

You still haven't said if yours isn't working properly. I know others have had issues and needed parts, but you're not saying that. If the game is going into your collective for league or competitive play, you're not doing your players a favor by disabling locks. Games should be kept as stock as possible in public or semi-public locations.

Not sure what you mean by averaged it out. Pitch should only be measured between the flippers. Manufacturers install bubble levels parallel to the flippers for this reason. If you're at 6.4 between the slings, then you're even less than that between the flippers.

Get it up to 6.5 between the flippers and level side to side. Stern moved their leg holes so that it should be close to 6.5 with all four levelers completely raised.

As I said, it gets it close. Leave your front ones up and extend the back one until you get 6.5 between the flippers. 6.3 between the slings isn't enough and will be slightly less between the flippers.

That small level you showed in the pic doesn't look like it would be good for checking side to side level. Need something wider. The Pinguy app is accurate, but a digital torpedo level would be better.

I said raised, as in raised up into the leg with no threads showing. Not extended or lowered.

Left to right is level. Front to back is pitch. There is no left to right pitch. Whenever you level a game, at least one of the front levelers should be completely raised, no threads showing, to get as much stability for the game as possible. If all four of your levelers are extended, you did it wrong.

No idea who you talked to at Stern, but that's wrong. Pitch is only measured between the flippers. As you've noticed, pitch increases as you go up the playfield. That's why you only measure in one place. Side to side level can vary from the top of the playfield to the bottom, so you check level up and down the playfield wherever the level will fit to get it exactly level.

Your game isn't steep enough. Easy fix.

6.5 degrees measured between the flippers. Start with all levelers raised (no threads showing), then adjust as needed.