I am a little late to the thread but say full action bedding is the way to go. I know a lot of good shooters who bed only the front recoil lug and tang area. it works for them. It is simple and requires much less masking-off; however, I am for a full action bedding job. if you are going to bed your rifle it is more masking but not much more work to bed the entire action. Especially on the V-block aluminum bedding blocks. I have several Sendero's and notice the mating of a round receiver and a v-block rarely results in a stress free platform.
It could be solved by a spot bedding of the action and tang, but since the stick is torn down for the spot bedding, a full bedding job isn't a lot more effort. Mask of every piece of the stock even where (in your wildest dreams) epoxy could never enter (because it will), wax up the receiver and have at it. It is a simple project that anyone with a little patience, care can do this at home.