I got the problem fixed! I was able to move the dish to a new location since I have it on a temporary mount. After spending a few minutes finding AMC 21, I fine tuned everything, and I'm happy to say all signals are back and at their normal levels! Here are the readings:
11916 V: 71%
12145 H: 73% (Massachusetts uplink; 72% normal)
12155 H: 70% (New Mexico uplink; 67%-71% normal)
12163 H: 58%-63% (normal around this time; 72% at night)
12169 H: 56%-67% (normal around this time; 72% at night)
12180 V: 85%
11916 V: 71%
12145 H: 73% (Massachusetts uplink; 72% normal)
12155 H: 70% (New Mexico uplink; 67%-71% normal)
12163 H: 58%-63% (normal around this time; 72% at night)
12169 H: 56%-67% (normal around this time; 72% at night)
12180 V: 85%