A correctly aligned dish will show signal levels of:
high 90s or even 100 on MOST of the transponders on the 101 satellite (some will be low or even zero because they are spotbeams carrying locals directed at different cities)
high 90s/100 on MOST 119 transponders (again, several 119 transponders are spotbeams)
high 90s/100 on the few active transponders on 110. Note that the continental US does not get ANY programming from 110.
At least high 80s, preferably low to mid 90s on ALL 99c/103ca/103cb transponders
99s and 103s spotbeams carry HD locals directed at different cities so seeing many low or zero signals is quite normal.
There are several satellites at a number of the DirecTV satellite slots but many of the transponders are grouped together, what you see on your screen are not necessarily "satellites".
103ca and 103cb are all CONUS transponders carried in the A-band and B-band frequency bands respectively, but the physical satellites carrying these also carry spotbeams for locals which appear in the 103s transponder listing, along with transponders from another satellite carrying only locals. Similarly at 99 where 99c is CONUS transponders, and 99s is spotbeamed locals from the same physical satellite delivering the 99c CONUS plus locals from another satellite carrying only locals.
When aligning the dish you don't align for specific satellites. The dish is designed so when you align correctly for one satellite all the others fall into place. There are several articles on the internet describing how you align a dish correctly (even without a meter) but basically it gets aligned to 101 correctly (in theory using a process called "dithering"). Then you check the 99c/103ca/103cb satellites and fine tune the dish if the signals aren't strong enough.