[bigeasy1]

This may not be of help as I run a Tsunami(scepter) so the mounting is a bit different.
I also run 4 Scotty 1160 electrics with 14 lb Shark weights.
I run a T8 Yamaha 4 stroke high thrust kicker off the starbd side. I have two of the riggers mounted at the stern and the other two on the port an stbd sides just a bit fwd. of the hawse pipes.I do worry about getting a rigger cable in the prop of the kicker,but 9 years now and no issues.
I should add that the boat is powered by an I/O.
I'm also a salmon fisherman predominately Chinook and Coho with a lot of Steelhead mixed in.
As for tangles,most are when a king decides he wants to hit a deep spoon and get into the other rigger lines along with the copper and wire lines that we run off the planer boards.Rarely do we get tangles in the rigger or board lines.Our trolling speeds are most commonly around 2 to 3 mph(these speeds are at the down probe)Surface speeds like gps sog can be 1 or more mph faster or slower depending on the currents from the Niagara river