NEED HELP!!!!!

So I have an issue that I and everyone I took it to can not seem to fix, my 98 DR650 started leaking from the carburetor almost a year ago(seems like it's from the overflow)and chokes a bit once in a while at high rpms ,I've had the tank cleaned and coated because there was a small bit of rust in the tank, I thought it blocked the needle from closing and then had the carb checked and cleaned by suzuki themselves and numerous other shops, they told me the carb is in perfect condition (98 stock carb), so usually after having someone check it and putting the carb back it runs perfectly without leaks for a day or 2 and then it just starts leaking and all that again. It leaks while standing and when idling and running, so now I have to keep closing the tap when parking and when driving it just leaks..

Has anyone else had similar issues and know what's causing it??😕