I have been up and down from Largs to IOM many times .
In your boat I wouldn't worry the tiniest anyway. 10m and 2x315s?
Your kidding aren't you?
If you drive close to IOM, inside the Whitestone bouy you will be clear of any turbulance you MIGHT encounter further offshore.
Or, if you are not confident with that, if you run outside the Whitestone and head for the outside of the Bahama you will be totally safe.
"Ribbing-the most expensive way of travelling third class"