Speaker shootout update; aggressive treble eliminating some (fairly?)

I've been trying out speakers in a complicated shoot out, both bookshelves and towers — all in my home with my gear. I'm looking for speakers obtainable up to about $4k but could go up (or down) a bit if the right thing came along.

Basic facts: All speakers were run in at least 100 hours. Room is 27 x 14 x 6.5 ceilings. Powering with all QS tubes, 60w, NOS, tube R2R dac, and decent cables. No terrible reflection points; room not overly live or dampened. REL R 328 sub available but I did most listening without it.

Recent auditions, type:

Klipsch RP 600-M (budget singleton of the group)
Fritz Rev Carbon 7 mk II (bookshelf, 2 way, soft dome)
Focal 936 (tower, 3 way, inverted metal)
Martin Logan Motion 60s XTi (tower, 3 way, AMT)

Coming soon:

Salk SS 6M (bookshelf, 2 way, beryllium)
Dynaudio Evoke 30's (tower, 3 way, soft dome)

Let me speak just to the problems, rather than what was good about the speakers. So far, I've found the Klipsch, Focal, and especially the Martin Logans were all too bright — forward, aggressive, "turn it down" treble.

The ML's were the most impossible to tame and hardest to listen to on more tracks. (I did a lot of hanging of towels and other dampeners and other soft things to try to see if I could bring them to heel. I varied the recordings used. Changed cables/wires. No luck.)

The Focals were occasionally too bright; their bigger problem was a bit too much energy in my small listening space. They were better when I plugged their ports with socks.

I'm looking forward to how the next two speakers sound. The Dynaudio towers, I notice, are 10 inches shorter and half the weight of the other towers; not sure what that might mean, but it could just be right size for my space. I'm looking forward to seeing if the Salks bring more detail to the treble without also being too rolled off or harsh.

Hearing is very personal for physiological and taste reasons. However, if anyone has any thoughts about why I might be experiencing some of the phenomena I am (harsh treble, especially) based on my room or gear, etc., that might help me understand factors I'm not fully appreciating. Thanks.

Agreed with furiouslyadrift about the raal tweeters. I have the ascend acoustic sierra towers with raal and they have very narrow vertical dispersion. Great clarity at ear level in your sitting sweet spot, but more subdued when standing up. 
I’m puzzled as to why you have not tried or auditioned wharfedales. It seems you are fixated on aggressive treble. Why try and fix something when you can just select a speaker with a non aggressive treble. Wharfedales are known for their smooth and somewhat warmer tweeter. I would recommend you audition the lintons or the Dentons.. there are also the 4.2's as well as older stock towers such as the diamond 240's if that's your thing. I have never had an issue with aggressive anything with a wharfedale. 
High end is pretty directional, and bright tweeters are usually beaming straight from tweeter to ear, so room mitigation is limited.

From experience, when a company features a special tweeter, there seems to be a tendency to showcase it a little too much, which I've heard on several berrylium offerings.

Re: Celestion vintage. Never owned but remember the Ditton 66 as a wonderful sound.
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With the monitors try putting them on low stands given the low ceiling, maybe with slight tilt back.

Also play with toe-in. Brightness can be tamed often by not having direct tweet exposure to ears. Also often helps with soundstage and imaging.

The Fritz will be hard to beat if you can get them set up optimally. I’d stop and work on that first if it were me.