I'm planning to add a Penn downrigger to my 232 Gulfstream this season when fishing for tuna and wahoo. I recently purchased a used downrigger that is equipped to the rod holder mount, this seems to be my perferred method since I would like to remove the downrigger when not in use. My question is do I need to add a backer plate to the gunnel rod holder that is going to receive the downrigger? Also, what's everyones opinion on using a downrigger ball vs z-wing?