I currently have MK Terrova with a 45" shaft. Perfect length. I am replacing with an Ultrex that will have a Live Scope transducer mounted on the shaft. I know the LS transducer will have to be further up the TM shaft, but still be below the waterline. Can I get by with a 45" shaft on the Ultrex or do I go with the 52" shaft to be safe ?