Snips, when you responded to my message regarding the distance between transducers you reference the water movement between the transducers. Do you think it would be effected at slower speeds when trolling, say 5mph?. I think i am going to be able to create at least 5 to 6" " between the two transducers on the transom as i am welding another bracket. I have the dff3d mounted now just about to add the 258.