Onda, I have the 11 also, dont'know what the 8 feels like but 5, 4, 3 are the magic kites..
the 11 is not playfull at all. Not all the good Peak's plusses are available on the bigger sizes.. wind strength is an important factor in drift, and size for playfullness.
I'm very pleased with the 5 and even more with the 3m.. a 4m is on my wishlist for 18-24kts.
The 11 is a session saver for me, in 7-15kts (15 is not fun..) with drops to 3-4 kts on my local pond it is so far the best kite to use for foiling.