After the thumb nail test are you going back to the 4k for a bit?
Also are you incorporating X strokes?

You should consider expanding the types of testing you do and observe the results, you need to find a test that works consistently for you at each stage.

Hair popping (arm) and how it does it, Thumb pad test, and visual are the three I use to verify the bevel.
I use the TNT if I have had to do major work but it will only tell me if I am getting close enough to bother starting the other tests.

Spend some time figuring out what the test is telling you.
I would also like to ask how much experience you have under your belt with the actual shaving with a straight and stropping,
as these are major contributing factors in shave results as you start your journey.

And definitely make the meet there will be no bigger boost you can get, not to mention the great people you will meet.

Regards
Pat