You should have 95+ on nearly all the 101 transponder. There is also 99(ca), 99(cb), 99(s), 103(ca), 103(cb) and 103(s).
You need 80-85 or better on the ca and cb transponders and you can ignore the lack of signals on the (s-spotbeam) transponders. The antenna is extremely sensitive and most be pointed in 3 directions. Azimuth, elevation and skew. The skew can have the most effect on the accuracy as it compensates for the different elevations of the 3 satellites. Call DTV and have them send out a tech to get the antenna properly pointed.