250-500cc Stalls when leaned over

1994 wxc250.
My bike has recently been idling way down and usually eventually stalling when leaned over slightly (not even all the way to the kickstand contacting the ground) in both directions. If i give it a little throttle it wont stall..

I recently rebuilt the carburetor and cleaned it in my ultrasonic cleaner and blew air and carb cleaner through all the passages... She ran fine for a few weeks. But now has developed this problem. I set the float heights when i was in there. I believe the specs I found were 18 to 20 mm with carb leaned over at about 45deg. Is that correct for my original early style mikuni tm/tmx?
Odd how the problem didnt exist right after the rebuild. . .Im going to take the carb back off and have a closer look at the float heights i guess. . . Anyone have any advise or other ideas aside from a new carburetor, because i know this one was working fine Thanks.