Ooooh, how do you do that? I just bought a sack of 2-row and would love to still be able to make my favorite recipes which call for MO (silly LHBS was all out).
If you use pellet hops, try whole hops instead. That cleared up my problem.
Ever since I've started kegging, I noticed my beer would taste great for the first couple of days, then over the course of a couple weeks would take on a harsh bite/twang. This off flavor would persist up to a month...