Throttle Bodies out of balance

My bike has not seemed quite right of late. She pulls like a train on speed and revs beautifully but doesn't sound quite right on a steady throttle when not under load. Can't describe exactly how but it doesn't sound quite right. Anyway thought I'd check the balance of the throttle bodies. This is what she is like at tickover.



The left hand tube is the rear cylinder. Now no matter what I did I couldn't get them balanced. If I turned the screw futher in they got worse. if I came out this is as good as they got and then the screw was no longer touching the metal below. Any ideas? Rather not have to take it to KTM and get her plugged in but I may have no choice. She is due a valve clearance in just under 1k miles.

Wish I could offer some advice but this is out of my experience. But there's enough stuff on here saying that balanced throttles makes a huge difference so I would definitely be looking to find the solution.

Are you around this Sunday Essex run?