Paired bearings do scuff and fail at elevated RPM which is why Race Kit big end bearings were single rollers on the CB72. If you have an alternate bearing I'd use them in our motors too. We have not had a failure with ours running up to 11,500 at Daytona and Road America, so I wouldn't worry about it too much. If a crank was apart for new rods, though, it would be a good time to swap in better cages. Just avoid Honda supplied rollers. They are way to sharp on the ends and cause the cages to crack at the corners of the slots. We used to have to hand stone all the rollers before building a race kit type crank.
Target RPM should be 14,000 with that short 41mm stroke but the 160-175-200 motor cannot go there with sloppy cam control and thick rings and Mother Teresa long skirts. 200 has the same thick rings as a CB77 and they flutter above about 9,500. That's why they are trying a set of super light pistons with thin rings and short skirts like - insert personal fantasy here
.
For really high RPM you need to reduce pumping losses too and change to a 180 degree crank and a high rpm type cam profile. Unless the motor can reach very high RPM, any cam beyond the mildest will hurt power in the middle and will add nothing at the top end.
Get those long cam chain guides in and eliminate one of the issues.
On the forks it sounds like the center to center distance is different between the top and bottom fork crowns/yokes/triples.