I've tried a handful of Adagio's flavored teas now, and they all seem to use the same base tea, a Ceylon, which in my opinion, is a very good base for flavored teas.
However, in some cases, the blends seem to work better than others. For example, in the Pumpkin Spice tea, I thought the base tea really clashed with the flavorings. I think the base tea is a much better match for the Cranberry tea. Others are in-between.
Have you considered using different bases? I'd really recommend this. My intuition might be to use a Keemun as the base for the Pumpkin spice tea...just as an example.
All this said, I'm not a huge fan of flavored teas, so take what I say with a grain of salt.