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Randy I have the same vintage (50th anniversary edition) new boat and motor as you. I too think it is strange to have such a long (10 to 15 degrees) delay in forward for the acceleration to kick in but don't have that problem in reverse. I got used to it and now it is just expected. Having run many inboards and only a few OB's I know each is different and the IB's are much more sensitive than the OB's.
I don't know if it is a Bigfoot thing but yes they seem to make a good thud when shifting as compared to some other. As mentioned before that will lessen in the water and I hope you are using the hose hooked up to the center back of the motor and not muffs when running the engine out of the water as you get better water intake.

Your Sport must be brand new with only 20hrs in 8 year and therefore must have sat still for long periods of time. Check the oils and especially the gearcase oil. You must have gotten complete boat and engine manuals?

Welcome and have lots of fun with your new ride, you have more constraints than I have, not having driven the boat yet, I had to check mine just before the water froze over.