Awesome dude, now you see what I've been talking about, then the right angles will be next level!
For what it's worth, I got the o-ring kit with my second TM recently, it only comes with red o-rings, for the cooling unit and that big one for the stem. No clear o-rings, no blue o-rings, no o-rings to fit anywhere else that I can tell...
So if you are missing that o ring at the top, inside, it is clear on both of my units that are over a year apart, I would make sure to specify maybe in the notes when you order the spares, to make sure they give you the o-ring you need!
And yeah if you are missing that, that would explain why you have to start at level 7, there is an air leak somewhere in there without the o-ring...
A few pages back I posted alternative stem o-rings by the way, that come in clear instead of red and are a bit thinner, allowing the stem to insert more loosely into the TM, while keeping the top ring screwed down.