'81 KZ750-4 float level

Can someone shed a little expertise on float levels? I am having problems with the engine only able to run with the choke fully closed or slightly open. There are no vacuum leaks and i completely cleaned the jets again paying special attention to the pilot jet circuit. Everything is clean. I measured the float levels and i found them slightly low. Book calls for 4mm +- 1mm.. I estimate that i am about 6-8 mm right now. I know that i have to bend the tangs on the floats. The question is:"Will the slightly low float level cause the problem that i am having?" Any info will help. Thanks

I'm thinking you mean the fuel level is 6-8 mm below the seam between carb body and bowl when measured using the tube method - see pic.
Since it should be 4mm or thereabouts I would say there is a very good chance that the low level is causing the problems described. Definitely worth a shot to try and get the fuel level within spec.

A real life pic of where the level should be.
Carb Keihin CV34

OK.Thanks. Now, what is the best way to bend the tangs to make sure they are all equal and so i don't have to assemble and reassemble multiple times?