I've found not going any deeper than the stem is wide has turned out the most consistent results so far as well.
It seems to be the Tinymight Packing Principle and a benchmark of sorts. I follow this too though early on they were deeper than wide (good results but not necessary for me; I don’t measure my flower and do it by eye).
Got my accessories order, finally, on Friday consisting of an extra short stem, cooling unit and extra large clear orings for atop the glass cylinder. Haven’t attempted inserting the oring to replace my original one that came out when I attempted the heater screen mod (which I never accomplished). Interestingly, the new short stem is just a tad narrower than the original as it’s a bit looser than the original. Not a big deal as I know there can be tolerances even with glass from lots of posts previously and those who use 3rd party glass stems (such a great forum community too! - I learn something new everyday!). Nevertheless, the Tinymight still rocks almost 5 months now, almost daily, and the one vape I prefer reaching for over my others.
Oh, got a new medium SLX 2.5v grinder which is ok. Results with my older 2 inch Sharpstone with standard grinding plate works just as well and it like the smaller size for loading into jarvials, which is how I store my flower - because of the TM, since I can just inhale flower into the stem easily from the wide mouth jarvial (I have many and many strains too
). It’s always a medium grind for me and works well in the TM. However KIEF is the answer! I just scraped up a half jarvial of the stuff. Load some first in the TM stem then some flower so it’s between the fine kief and the heater screen and you get bonus effect. Just wonderful! So it’s feasible a fine grind, in part, will work just not near the heater. I won’t do that (it’s opposite for my Hopper - load medium grind first then top off with some kief. Delish!). Happy Monday.