Keep in mind they are replacing HR-10s that fail with HR-20s, so if there is anything at all wrong with your present unit, you may not have to pay anything.
I find it odd that we pay up front, but still don't own the receiver.
Looks like you are getting plenty of signal on all birds. Not all transponders are in use at all times. Also the bird at 110 only has 3 active transponders used for D*.
As long as the signals are over about 80 you should get a good picture. Do any of the readings that are in the 90s dip...