Okay, so you've got plenty of experience with some of the bigger bikes then and how they work off road. Yeah, the Aprilia is a superior bike vs the T7, but durability is unclear to me. I just don't know anyone who has one. Couple Desert X's in my group though, they are very much loved by their owners.
Unfortunately all of these bikes feel really top heavy picking them up, but the 790/890 does have that low wide tank going for it. Unfortunately that tank is also why it throws so much heat at your legs. My 790 came to me with a cat delete that wasn't installed, installing that dramatically reduced heat.
The light pull clutch arm for the 890 fixes the annoying clutch, and it's cheap. I didn't like the stock clutch feel either.
The 690 with a rally tower is still kind of the unicorn sub 400 lb adv bike in a lot of ways.
I also have an FX450 in the garage with a big tank, rally tower, 6th gear added, etc. It was my rally race bike until I got the 690 to build myself an RFR replica. It's physically quite a bit smaller even than a 690, and I'm quite tall. It just ended up being cramped for very long all day racing/riding. The 690 is far more comfortable. Of course, story is probably different if you're not so tall. Highway manners are fine, but the light weight does work against it in that wind blows it around more than the other bikes. I've never put bags on the back of it though, that would make the front end pretty darn light. Definitely vibrates a bit.
The 701LR is an interesting beast, not a lot of those around so it's cool that you got to test one out.
Sounds like you've already got a direction though, maybe it's just time for a newer counterbalanced 690/701 and a rally tower. Or find yourself a 950SE....
I think there's a Kit690 setup for the newer frame, that's the kit I started with, just welded a lot of stuff on that was meant to be bolted. I raced with a guy with an Omega and a guy with an Aurora kit about a month ago, the kits all have their weak points but the Kit690 seems to win the durability competition. Just not as exotic since it's all aluminum instead of carbon. Mine weighs 375 lbs full of gas. Not as smooth as a T7 (counterbalanced bike would fix that), but feels more powerful, similar weather protection, easier to make the suspension work right, noticeably lighter, etc.