Turns out the problem was the tracking speed, not sure if it is right but at 70mm I have to lower the speed all the way down to 3 or 4... is that normal? Even one click higher at 5 it starts slapping around... Seems like I won't be able to zoom in with a telephoto with active track enabled... is it really supposed to be like this??

Turns out the problem was the tracking speed, not sure if it is right but at 70mm I have to lower the speed all the way down to 3 or 4... is that normal? Even one click higher at 5 it starts slapping around... Seems like I won't be able to zoom in with a telephoto with active track enabled... is it really supposed to be like this??