I just checked my new stems and the evo baskets are still a snug fit.Already noted similar differences from the TM stems inner diameter, one point not even the gaskets would stop the CU from moving... had to use the Crafty smaller ones and worked but yeah i guess from batch to batch they have differences, i didnt spot any difference with the EVO baskets so far
What temp you use? your AVB look a bit dark imo, should try @dzoinp mod, the load will be further away from the heating element and that prevent those darker spots. I Really like that mouthpiece.
Regarding the ABV, I'm quite content with how I have the vape configured now; no need to twist the stem or stir between hits. The basket in that photo can be positioned anywhere in the stem and it's easily twice as deep as a standard rimmed basket. It's just the nature of the beast; with that much herb to travel thru, the vapor's going to be cooler by the time it reaches the bottom of the basket. I really don't think that there's enough of a difference in the abv from top to bottom to justify stirring and I'd be (pleasantly) surprised to find a configuration that gives more even no-till abv with a load that size.
I usually do temp steps from 4.5 to 7.5(ish) on the dial.