Rpm will drop if in slow travel mode. Here is the funny thing, when operating the travel lever left or right, as I explained before, the pilot signal oil gets blocked off and builds pressure and the travel pressure switch reads the signal to tell the PVC that travel has been operated. So in saying that it should not matter that you swapped the pilot lines as the signal is not from the pilot lines but from the spool blocking the signal line. As I understand the signal comes from the travel pressure switch on the valve bank. Just to prove that, swap the wires from the 2 travel pilot sensors under the cab and then try it again.
Also on your time cycles, get a swing cycle time. 3 revolutions from a running start. This is the same pump as the left travel.
Has there been any attachments or other valving put on this before? Any history on how this problem came up? All of a sudden? Was the valve bank ever repaired?? Did someone have to unstick a spool ever before? Did anyone ever have all the spools out? Please please please say no to the last one.