This probably isn't going to help much but... there were a few threads awhile back about the same thing where they describe somewhat in detail about how to recalculate your hops additions. If i'm not 100% wrong i think if your recipe calls for (example) 2oz of xyz type hops for a 2.5 gal boil, then you would only use 1oz in a 5 gal boil. Like I said, I could be totally wrong in that calculation, I am still doing partial boils. Try searching the forum for full boil vs partial boil or check out the "stickies" in each section. I can't remember where on here it is, but I know it's here.