I would recommend you also have a look to QoS statistics, to confirm that there is actually a difference between “before hopping activation” and “after hopping activation”. you might get a clearer picture of what is really going on, and whether the issue occured right at the time of the hopping activation or not.
however, if you’re sure of yourself, you must contact your vendor (which brand is it ?), so they can check the frequency hopping is working well in your release.
frankly, unless there is an issue in your network software, because i can’t see how frequeny hopping can relate to call setup and handover delays… but i don’t know… i simply never experienced that or heard about it, and i can’t even imagine what could be the problem.
good luck ! and tell us which vendor is it…