The throttles on my twin Honda 135's on my Hewes AK 26' have always been uneven when they are at the same rpm, and one of them keeps creeping back if I am not holding it. The amount of unevenness and rate of creep vary some, but it is almost always the left throttle has to be ahead of the right, and it is also the one that creeps. I noticed this when I bought the boat new, but the dealer said although it could be adjusted, it would always be uneven when getting the rpm's to match. When I am cruising I sure would like to let the throttles go without having to constantly readjust one of them, and sometimes the right one moves too. I do have counter-rotating props.