[PGSigns]

Well you have a couple of things wrong. Full advance will be at cruise with the ported vacuum. When you step on the gas the vacuum will drop off and it will retard the timing from 0 to the full 10 degrees depending on engine speed and the manifold vacuum level. One other assumption you are making that the timing pointer is correct. Very common for them to be off a couple of degrees. Go up 2 degrees at a time and see what you get. Also no were do you talk about reseting the idle air setting after each timing change. So you may have 4 degrees set but only 1 or 2 actual. The statement that a weber carb needs more timing does not make sense. Its job is o meter fuel and the brand of carb if both running about the same AFR should not matter.
Jimmy