This is just a guess, but I just got finished tuning my derailleurs this evening. Perhaps the point where you connect the cable to the derailleur needs to be adjusted so that when you shift up, the chain is not pushed out as much. My problem was just the opposite. I could get down from 2nd to first quickly, but could not get back to 2nd from first easily and just about could not reach 3rd. A little tuning of the cable connection solved the problem. It might also depend a good bit on the riding you do, whether you'll spend the majority of your time in high gear or low gear as to the exact adjustment.