The setting should be either UBBCode or HTML and UBBCode roebuck - I've changed your post from HTML to HTML and UBBCode to fix the image problem.
Flat spots such as you describe are nearly always caused by lean mixture. In your case, it sounds as if your carburetor cleaning process has not been completely successful. My guess as to the reason, is that your dishwashing detergent did not do an adequate job of cleaning out the progression holes near the throttle plate, and one of the holes is still partly obstructed. Frankly, I'm surprised that the detergent worked even that well. The quickest and easiest way to clean out the passages in a carburetor is generally, to use carburetor cleaner. In the case of small orifices that can't be accessed directly, it is just about the only way. Also, I suggest in future you avoid putting wire or needles into progression holes since they are very finely calibrated and easily damaged in the soft aluminium.
