So I brewed on Monday

. And I've just recently started taking my numbers seriously (read VERY seriously). That's become part of the fun for me. So here's what happened.

I adjusted my grain mill and slowed my sparge rate down and went from my traditional 70% efficiency to 79% efficiency. That meant that my collected runnings went from an expected gravity of 7.75gal of 1.043 wort to 7.75gal of 1.048 wort. It was only 5 points. Not a huge deal.

But since I'm brewing a clone recipe, I want to get my numbers right in where the recipe calls for (1.043 NOT 1.048). So I thought...I'll just add some water, bring my volume up and have a bit more beer at the end. I calculated that I would need 1gal of water to bring the gravity down to 1.043. But then that got me thinking. If I add water that'll mess with my bitterness and other hop additions. Because whereas I was supposed to start the boil with 7.75 gallons, I would now be at 8.75 gallons.

Since I didn't know the calculations to make adjustments to my hop amounts, I just left it and figured, I'll make adjustments in the next batch. So...can somebody help me out here?

How do I calculate adjustments to my hop amounts based on an increase (or decrease) in my volumes? I know some of you might not sweat it, but I would like to know "how to do it" before I decide "whether or not to do it." Thanks!