Well I brewed it the other night. It tasted pretty good. I did add a couple pounds of Lyle's Golden Syrup at the end of the boil. My O.G. was a little lower than I expected. My target was 1.090 and I got 1.090. I don't quite have 5 gallons. But I was going for gravity over quantity.
Sounds like you'll be fine. The Lyle's will definitely help to keep it from getting too sweet.
At 1.090 you're probably closer to Barleywine than any IPA (though with all the weird variants popping up who can say)...either way, I'll bet you'll have one fine brew there. Be sure to set some aside to age so you can assess the affect (usually quite positive) that age will have on it.