I was under the impression that Gosling's Black Seal Rum was hard to come by, so I grabbed a bottle in a local shop when I saw it today. I want to make some Dark and Stormys. I didn't realize the Black Seal came in three different proofs (80, 140, and 151). I got the 151, and it turns out I wanted the 80. So can I just halve the amount called for in a Dark and Stormy, or will that not be the same effect? Not real sure what to do with this overproof rum. Thanks for any advice.