I actually just stopped putting bags in the kegs all together. I've been doing comparisons and the kegs that have hop bags in them have a grassy off flavor. Some (most) of my friends don't taste it, but I do. My last keg has no hops in it and it's just plain better than the previous which came from the same 10 gallon batch...only difference is I dry hopped the one fermenter with an extra 2 ounces of pellets which made it hoppier than any other IPA I've produced, even the one before it with 3/4 ounce of Simcoe.
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Yeah--I think I am sticking to dry hopping in the fermenter. Let it ferment 2 weeks, add hops and go another week. I think you need to be gentle with the dry hops or it will give you bad flavors. Live and learn. Wish I didn't ruin 3 kegs before I learned, but that's life.