XJ frustrating issue

I'm not sure if I'm posting or doing this correctly but I need some help.

I have an 85 xj 700. It idles fine revs to redline in netrol fine sounds good. In gear riding it runs and rides good untik 5k rpms under load. 1/4 to mid throttle it runs strong and pulls good. 3/4 to WOT past 5k rpms it sputters coughs and breaks up horrible.

I have new coils new plugs I have had the carbs off and rebuilt the carbs and pulled them off and cleaned them 3 separate tims tbining i missed somthing. I have had them all the way torn down but did not brake them apart. Put in all new rubber new needles in with springs and wahsers adjusted them to 2.5 turns out I balanced all the carbs.

It has an after market UNI filter. I removed the filter completely took it down the road and it made no difference to the breaking up.

I tried pulling in the choke while it is breaking up and it makes no difference.

Compression is low but even on all cylinders around 100 psi. Not great but I don't think it would run good but not rev out?

I had an inline fuel filter removed it thinking its restricting fuel and it made no difference.

I ran the bike with the petcock on prime and it makes no difference.

The plugs are reading lean.

The only thing I can think to adjust further is the float height. I set them all to 14mm above the gasket base. Would a out of spec float height cause this to run like this?

Haven't checked the valves but I figured if it starts good and idles well bad vavles wouldn't just cause issue under load after 5k rpms?

I am pretty mechanically enclined and very familiar with carburators but I cannot figure this bike out and why it won't rev out under load.

Any suggestions of things to try? Thanks in advance.