I may be biased but hobby horsing has never been a problem on the 430. I purposely designed the bottom curve to among other things, avoid pitching. I don't sail a lot in lumpy conditions preferring lakes and 10 - 15 knotts of breeze but when it does get up I still don't see too much movement.
I do however have issues with lee-bowing on occasions in 20k wind but I'm of the opinion that it's more a function of incorrect mainsail trim rather than hull form.