Amy,
I am at a little bit of a loss on what to recommend to you. And a little bit perplexed. I went back to your "Problem" thread and saw that your post respond that your ribs came out perfect. I hope you can understand my confusion.
But since the meat portion of a rib is not that much, flavor on the inside meat will be more from the raw product you are buying. I am not saying you are buying bad ribs, but it is hard to find pork that has much flavor in it anymore due to the genetic lines that most producers pursue. As such, my belief has always been that the flavor profile of a cooked rib will come from the rub, the wood and any, if used, sauce or glaze.
As other posters have pointed out, maybe you need to try some different rubs. A good source is
www.hawgeyesbbq.com. I personally use Bonesmokers rub myself. And even though I use Bonesmokers, I do add a few other items to the ribs in addition to the rub such as peppers and turbinado sugar. I know a number of people who use the Cimarron Doc rib rub.
The great part of BBQ is that you get to keep trying until you find the right mixture.
One question before I stop, when you say you don't get enough flavor, do you feel the ribs are lacking in heat(spiciness), sweetness, smoker, etc.
Hope this helps some.