Thanks for your great review, about 3weeks ago I've received mine reshell & upgrade of SE535 to a 8 drive 4way crossover that is build by Rooth just like your LS8.
In which I also specially requested mine to present the sound in a more analytic presentation. Which didn't sound as forgiving and as smooth in the high frequency region as you have mentioned in your LS8's review. Beside that I've had very similar bass impression of mine upgraded 535 to your LS8 for that bass response with the sub-bass rumble that's slightly out of control to my taste, but when comparing to 16Pro's mid bass rumble I find it slightly more enjoyable. Thats mine's frequency response curve, that suppose you can see its rather similar to yours beside the mid range to mid/high range frequency is different. As according to my the shop that I deal with Rooth kept parts of 535 to build the upgrade therefore it kept the out standing mid/mid high range performance of my old shure 535.
anyway great review, will be looking forward of reading your ACS T1's review, as I got my order through to them not long ago.