I'm prepping my next set of planks. The two WRC boards I have picked for the middle planks are of differing weights, one feels nice and light and weighs 10-11 lbs @ 11' and the other is a bit heavier, 13-14lbs @ 11'. The heavy board has to be dry by now, it's been drying for over 8 months now and is only 3/4" thick, from an already seasoned log.

So, is it a bad idea to use two boards of such differing weight in a small lapstrake skiff?