I sailed a Hobie 16 last summer for the first time, and while pushing hard to weather in big winds, in a moment of inattention the leeward bow dipped just a little, and I realized I should have panicked about the time I went flying past the tip of the mast
There is a lot more hull volume and buoyancy to the bow of a Hobie 18 than there is in the H-14's and 16's. Plus, the "rocker" shape of the hull is not quite so pronounced on the H-18.
The lip on the hull of the Hobie 18 doesn't lend itself very well to "wave piercing", but it also doesn't have the over sensitivity to "tripping" that is characteristic of the Hobie 16.
You can drive the Hobie 18 pretty dang hard.
I've buried mine all the way to the dagger boards and had it shake it off and pop back up to continue sailing.
If you go to
WWW.HC18.org and look at a couple of the photo's on my "member page" you will see that we sail the bows pretty deep and the sterns pretty high.
Good luck and have a lot of fun with your "new" Hobie 18
Stephen Cooley