Cool, let us know as I'd be very interested. The reason they quoted that figure was that with radial lace the hub flanges stretch which can result in bearing fit issues. CK can supply larger bearings if it becomes an issue but I have laced mine at 65kg and cant tell a difference in ride so will leave it - tho I did use spoke freeze to be sure nothing loosens over time. 65 seems low to me, tho not that low I guess. Id be interested to know what yours are built to simply out of interest, your builder obviously knows what works and lots of experience

I also asked the question if different spoke counts result in a different tension limit, since with radial lace the total flange tension = the total rim compression, this changes with spoke count. with 24 spokes at 65kg there is about 125kg flange tension so i wondered if 20 spokes would result in a spoke tension limit closer to 75kg resulting in less chance of loosening - and the same flange tension. I never got an answer unfortunately....