I haven't used Island Tobacco, but I have a large vial of their Honey Tobacco.
It's SUPER thick, black, and potent. I mix it at 1% usually, but could definitely get it down to 0.5%. It almost tastes and smells like a honey dutchmaster after steeping -- definitely need to let these steep for a week or so.
Give it a shot, the worst that can happen is you don't like it! Just don't forget to let it age!!