Ugh. You won't catch me putting any corn or cane sugar in any of my IIPAs. I guess it is a matter of taste, though.
Corn sugar (dextrose) typically is preferred over cane sugar (sucrose) because it is more fermentable and because sucrose can leave a cidery off flavor in your final beer. As the others have said, with only a single pound in an IIPA, you should not be able to tell any difference.
However, I am more concerned that you may have a different problem with a different solution. What is your OG, what yeast are you using, and what do you do to ferment the beer? What is your recipe?
If your OG is something like 1.090 or above, you probably are fully attenuated and may be able to simply adjust your IBUs to a better balance. If you are using a yeast that is not among the most attenuative or alcohol tolerant, you just may be able to switch that out. If you ferment in less than optimal conditions, you may be able to fix that. If you use a bunch of crystal or other unfermentables (on top of an extract that may already contain the same thing), you may be able to fix that.
I wouldn't just jump for the sugar before you examine the rest of your process and, maybe, learn something that could improve all your beers.
TL