Coo, for hovering I think the 16 x 4W is the bomb, gyroscopic stabilization is awasome and really seems to lock the plane in. Now for the bad news.....yes the spool up time is noticably slower, it's a heavy prop and that is to be expected I guess. Even though the spool time is slower I didn't have a hard time flying the plane with it and that was back when I had my OS .91FS installed! I have yet to try it on the 100 for a couple of reasons, I'm not sure it's totally broken in yet being the primary.

In your case I would say try it, mount it without the spinner cone and see how you like it. If you find it's not for you switch back to the 15 incher, no carving would be required.