blooming your k cup coffee.
i been trying out blooming my coffee for awhile, and trying it in a reusable k cup today with really really hot water actually helped a lot with the brew!
you just need hot water at 195 or 200 degrees and to steep your coffee pod into the water for a while. until "yep that will do!"
it will bubble and release gases. and after that now jam that reusable pod into the keurig machine and hit brew.
it actually has improved flavor of the coffee to me! might work for you?
EDIT
this is just a silly method i did, i bet there are better ways to do this!
but it seemed to work for me and my keurig.