yes the upshot is the motor seems to sit lower using the tick marks they give you on the pattern, had to carve away the triangle stock to mount the engine and subsequently I think I got the engine mounted a little low the first time. LE slats, that's a good question, they do add drag at speed, but don't know if they should affect pitch. I mulled over putting them on or not and since I have seen they really only affect the roll rate and not 3D performance in general (see Ali's vids) I put them on since I favor the STOL performance anyway, the stall is clean at low speeds, On the first landing I came in high, no throttle and flaired a little high and it just settled in with a slight plop. (you can see in the crappy cell phone video)
So, engine a little higher in relation to the datum and slightly more down thrust, let's see what happens.