So I currently have DFF3D which is limited to about 1000 ft with the transom mount transducer and the B164 elements. I would really like to be able to mark bottom and fish to about 3000-4000 ft as I plan to get into sword fishing at some point. Boat is on a trailer so a fairing block is gambling at best and would prefer to have a shoot through or a flush mount transducer. I have dual TZT2 12" displays. What would be my best option for a blackbox/transducer combo? Thank you!