So after looking through the setup pages, there isn't much info on the 591. Did not many sell or? So how different is the 591 vs Z7? Would an 8" jackplate be too much? I measured from where the pad ends to the transom and was surprised to find it was 14". I only want to buy one jackplate so looking for the right one between a 6" or an 8". Also looking to add power poles in the future. Thanks!