I used to own a 10'5" but went down to the 8'10" in candy but recently upgraded to the 2014 carbon, it "floats" me well and I am close to 100ks +/- 5. The 10'5" tracks nice where as the smaller WP's don't. Depending on your skill and balance run them in the Quad (yes I know the 10"5" doesn't come in quad) but if anyone does go for a smaller one put 4.7 on front and 4.5 on rear.
If your on the 10'5" wack a 140 centre fin in (you will lose some stability due to the smaller keel but it loosens up nicely once you jump on the tail)
10'5" is a good board just too big for me now as well as I have too many!