Yeah... Most aroma and flavor additions seem to mellow fast.. That's why most micro breweries are now putting born on dates with their IPA's... Columbus should be a good hop for a IPA.. It is strong.. You can't go wrong with safale-05.. I mainly use it for its neutrality.. If I'm going to make a regional style then I will change my choice in yeast.. My question for you is why did you do the 15min hop addition on the C3C? It's the best lawnmower beer ever.. My last batch I changed the 2# of flaked maze for 2 cans of creamed corn.. Turned out great.. But that's with AG.