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Dang. I did 1054 miles in 17 hours back in 2014 for the butt burner ride on my nc700x. That was with an 1.5 hour stop at a DQ outside Pensicola and 45 minute stop in Lake City to get dry from a super rain storm. Don't think I want to do that again, but who knows.
When you hit the rev limiter. 75mph in 6th gear, the bike is at 4000 rpms, 2000+ rpms below the rev limiter. I don't think you can hit the rev limiter in 6th, don't know about 5th gear- never tried. I maxed the speed in 6th gear once (100+ mph) and was below 6000 rpms.
Yep, all is normal. Nothing to get by hitting rev limiter (which you can't hit in 6th anyways). I have a 2013 nc700x also. 4000 rpms at 75mph is right.
The clunk is normal and I don't notice it. Even my little klx250sf has it. The Honda is clunk, the C50 is Clunk, and the bmw g650gs I used to own was CLUNK. The only time the service manual states to do a DCT resynchronization is when clutch plates are replaced.
I did the same a few years ago but with a large plastic cutting board from Walmart.
I also mounted the topcase bracket on it. For bigger loads, I can remove the top case and place the load on the cutting board.