Rob, since nobody else has answered and the man is currently indisposed—but doing OK I understand—if it were mine, I would taper the flaps and elevators.
Remember that I only have the plan and have not seen the kit. Also, I watch the sun rise over the Pacific just ten minutes down the street.
I have read that rounding the trailing edges of flaps and elevators is not a good idea but I have not tested it. I like the look of the tapered flaps and elevators and, by all the reports that I have seen, they perform well. Other factors govern the aerodynamics.
If you aren't in a hurry, check with Bob W when he is back on deck.
Cheers, Geoff