Update...has been a few months and the honeymoon period has been impressive in a good way. The new powerhead is eager to run, and having the extra charging capacity afforded by the Simon charging kit installed on it was helpful when the starter battery got drained enough from the downriggers and finders that the big finder stopped running. As it worked out, at that voltage the Merc had zero trouble spinning over and starting quickly. One of the ideas I had in my head was to throw a Generac IQ2000 portable genny on the back deck and connect it to the MK 3 way charger built in the boat for charging while trolling. So today I had a chance to try it out, and when the starter battery got low after several hours of trolling I fired it up and plugged in the charger while everything as running on a trolling pass. The generator was quiet enough that turning up the stereo a bit was all that was necessary. after around two hours of steady trolling with both downriggers running I turned off the generator and trolled for another two hours, the charge recovery was significant, and the genny was running with only fractional throttle, close to 6 hours continuous charging is available in that situation on a one gallon gas tank. That model is quieter than the equivalent from Honda...
The placement of the downriggers turned out to be great, no problems. One effect is that with the downriggers mounted there seems to be more lateral stability with regard to wanting to chine walk at higher speeds, more stable with the downriggers mounted, a bit of a surprise. More trim is needed to lift the nose, but there was enough from the Hydromotive wheel to lift the bow enough for the boat to skedaddle down lake at regular fishing load speeds.
The Helix 10 is great fish finder. but the 360 transducer is useless in deep water. Best when used in water shallower than 60-80 feet. The Ultrex turned out to be a fantastic bit of equipment that really made the whole multi species concept work as well as it did. The spot lock is great, and the auto pilot is a godsend when letting line out and dropping downrigger balls down to depth. There is enough speed to troll plugs, and with the genny connected to the charger I can troll against the wind if it changes direction in the middle of a pass.
Today the weather came up, it rained for a couple-three hours, the bimini top REALLY came in handy, we sat in the bucket seats under it and controlled the bowmount trolling motor with the remote keypad.. wow, dry warm and comfy in a long rain on a bass boat? yeah! Then the sun came out and started baking us, except that the bimini kept us cool in the shade.
There is no need to change anything, the concepts worked out very well. The boat fishes very effectively, it is smooth riding in chop, gets great fuel economy and is fast enough to shrink the lakes it is on very well...I'm really pleased with the way it has turned out.