I understand what you are asking.
Being that your bracket is a 24" setback the 478 pounds will carry better than the 30" setback. It will more than likely sit in the water just as my 20CC does with the 30" setback carrying a 200 carb at 389lbs plus the hydraulic steering where I have no issues at all. I guarantee I have one of the heaviest CC out there. (Especially with me in it:) It is not a self bailer either but it would still bail with the boat empty moored to the dock. Lots of weight was moved fore in my boat and the cap off restoration allowed for extra bracing of the transom which I suspect you already have being X-seadrive. Being that yours is a cuddy with more weight up front I would suspect it would be more forgiving than the CC with your proposed modifications.
My current set up is OK. Yours should be OK.
If you can give me until 9/14 and I can answer with confidence as to what happens when you add that much extra weight to a CC
Trim tabs always aid the operator under certain conditions but were not necessary on my boat. The main reason I hear for tabs is porpoising which is not apparent on my rig. I would not feel compelled to install them if I had it to do over.
Nice accessory.
There is no doubt in my mind that your cuddy would carry the extra weight of the four stroke and bracket. It will sit lower in the stern by an inch but no more than two inches. Isn't the 21v simply another foot of transom added to the original 20v?
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