It's very hard for anyone on this board to comment on the performance of your boat as the bulk of experience here is with deep v hulls. Your boat is a very different proposition. I have been fortunate enough to go on it with you to the IOW (very impressive BTW) and despite having a RIB of the same length and mucking about in boats of every type for over 40 years I would be very hard pressed to give an option as to how your boat, being a cat, would handle the very nasty conditions short steep conditions that Poole Bay in a F6 and over, plus wind over tide would throw up.
I did some reading up on your boat after our trip out and (I could be wrong here) it seems that to benefit from the aero and aqua dynamics that your boat offers you need to be going 35 knots plus so it floats/glides over the rough stuff. To do that speed in those conditions in a deep V RIB would be pushing it to say the least. Usually 18-20 is about as good as it gets often less. Added to which you have a very broad bow and a tunnel and very limited ability to trim up (your boat does not lift it's bow, it's not designed to and certainly didn't when we tried it on the way to the IOW) so slamming and or stuffing become a real possibility.
Larger hard boat cats seem to be rated very highly in the USA for handling rough conditions so I could be totally out of order here but I would really advise caution before tackling the sort of conditions that we could have here on Sunday. You will get caught out soon enough, it happens to us all, but I wouldn't go looking for it just yet based on the opinions of others who don't necessarily understand the dynamics of your boat and your admitted lack of experience of those sort of conditions.
Hopefully the weather will be kind on Sunday or we will pick a better weekend as it would be great to meet up again soon.