So if you subtract the 4 oz. that were used for dry hopping, 6 oz. in a boil isn't as overkill as it seems a lot of people think. If you pushed the majority of those additions towards the 15 minute mark I bet your beer would turn out less bitter and more enjoyable.
I recently did a RyePA that I hopped continuously throughout the boil and used about 5 oz. total. The end result was a very bitter beer but that is only because I was adding at least 2-3 oz. before the 30-20 minute mark.
Since that brew I have found that a slight addition at 45-30 to attain a foundation of bitterness is a good start, then ramping up the additions between 15 and 10 minutes really helps add to the flavor and aroma without creating a bitter bomb.
Also, maybe I am wrong, but 4 oz. dry-hopped for 7 days seems overkill. You could probably cut that in half and do 0.5 oz. additions every 3-4 days over 2 weeks and the beer would have a better aroma.
Also the comment about giving it months to mellow seems odd. I was under the impression that IPAs are best enjoyed in a timely manner as the aroma is the first thing to go on them and that happens in the first months of aging. I could be wrong but if you age this IPA long term you may mellow out the bitterness but it won't have the nose on it you were hoping for.
Lastly, seems like your budgetary restrictions are minimal if you are dumping this many ounces of Citra into one beer... mind sharing the wealth
Either way, every beer is an experiment and if you don't learn something, you are doing it wrong! Cheers!