Hugh, I do not have a ’99, but I believe the tab controls the timing of the pump relative to throttle position, but does not change the total stroke. The rod is now further along at closed throttle, but I believe the total amount it will travel as you open the throttle should be the same. So you have advanced the timing of the squirt but not shortened the stroke. This was covered by JD in an older post that I guess dropped off into the abyss, because I couldn’t find it... ...but I do remember talking to Sudco about the tab, the standard gap is a known quantity and is something that road bike tuners (big customers of Sudco’s) manipulate to improve throttle response. Point being they are a good source of information about this setting on your carb (Sudco 800-998-3529).