Hi Logan,
If you rotate your camera 90 degrees you will see if focus at the corner changes and move. Then you maybe have a tilt.
If the corners are out of focus in all corners then maybe the distance between coma corrector and sensor is wrong, can you fine adjust it or is it fixed?
Is your camera sensor bigger than the image circle from the coma corrector?
I can see what telescope you have, but what camera and coma corrector?
If close to the horizone maybe this will help:
http://www.teleskop-express.de/shop/...ektor-ADC.html
Takahashi must be the telescopes Rolls Royce.
/Lars