Bear
I got my new MES40 with the slanted drip plate two days ago. I seasoned it and during the seasoning process, I used the meat probe thermometer at various locations within the smoker. Last night I ran it at 225F-235F and finished smoke-seasoning it while moving the meat probe around again (each shelf - left right and center). In both the high heat (275F) seasoning and the lower temp season, although there was some variation, it was only 5 degrees or so. When I added chips to finish the seasoning process, the heat/smoke rose the fastest above the heating element (of course) to about the middle of the glass, but I did not notice the smoke "hanging right" due to the slanted drip plate. In fact, it looked to be pretty normal as compared with my old MES40.
I looked at the pictures of the drip plate and looked at my actual drip plate and I think the version you originally tested may be a bit different. The drip plate on my new MES40, while slanted, is closer to flat/level than what is shown in the pictures. It may also be a bit narrower - which would explain why the heat is more uniform than what you had when you were testing it.
Not sure what I am going to smoke on Saturday - either ribs or salmon. But testing it with meat in the smoker will be better than my quasi-scientific study. Boston Butt on Sunday maybe...
Ed