250-500cc No idle adjustment left

'10 300 with tmxx carby. I lifted needle to see if I can get better power as it's very lean half- full and now I have no adjustment on idle as its really dropped and stalls out. where as when clip was in the middle it was idling a little high. It's wound all the way in . I wound out throttle and elbow above carby adjusters but still nothing .
I dropped clip to bottom notch, as it was knocking big time at wide open..
What's going on?

Half to full throttle adjustments should be made by changing to a bigger main jet. Its been said a lot that the TMXX carb circuits have overlapping effects and that's been my experience. Change to a bigger main jet to suit full throttle, then lean the needle for tuning the mid throttle.

Your pilot jet is probably too big and you are having to open the throttle with the idle screw to add air which starts to get you into the needle circuit where the air screw has more of an effect. Try a smaller pilot and adjust the air screw at a lower idle setting. If the air screw can not get your idle crisp and responsive between 1 and 2 1/2 turns then the pilot is still the wrong size. In other words if it takes 3 turns or more out on the air screw then the pilot is too big. The pilot, air screw and idle screw all effect idle mixture until the throttle is barely cracked open and then the needle starts coming in to play. it is a common mistake to open the idle screw too far which forces you to idle with the needle in play. Having to screw the idle screw in a long way to get it to idle can also be a sign that it's time for a top end rebuild. (do a compression check)

Took the bike for a ride and blubbery as, so put it back to where it was and spotted a split in the boot underneath which I hadn't spotted.
So now need to order a boot and start again. Lucky I didn't lean seize it.running a 490 main , 45 pilot.