There is no adjustment procedure and the manual just describes replacing the wax unit. So, one has to figure out the adjustment. If it were me, warm up the engine to operating temp, wax unit should have no influence, it if does, back it off.... Then Sync the starter valves, set the idle to 1200-1300 (or you preferred hot idle). Then let it cool down and see what your cold idle is... 2000-2500 is fine (to me), and typically where I put it with mine that has the throttle cable instead. Even then, it will creep up as the engine warms up, all normal. In your case, when hot, it should drop back to where you have your preferred not idle. I'd think the wax unit at that point may have a little slack to the starter valves, i.e., no influence on them at all.
Are you using the proper starter valve sync procedure?? Check that no starter valve is sticking....