I like it! It looks good to me. A 60 minute boil is sufficient. What I would suggest doing is splitting the extract, and adding only 1/2 at the beginning. At the other 1/2 near the end. It'll make big difference in a 2.5 gallon boil, and create a fresher beer taste (more like an all-grain beer) without the "cooked extract" taste.
4 ounces of biscuit malt is enough, at least for me. It has a nice flavor, but with a dry finish, and too much is overpowering. I think your recipe is solid, just as it is.