The Astromaster 130EQ is let down by its mount and eyepieces. I bought one long ago and was disappointed and frustrated with finding things too.
First its red dot finder is almost impossible to use, I replaced mine with a telrad and could get any bright planet in view of 20mm eyepiece.
Secondly, I replaced my eyepieces with 8mm and 24mm Baader Hyperion eyepieces, the 130EQ responded well to these EPs, but 8mm is about as far as I'd push this scope, atmospheric conditions are very apparent in my 4& 6mm planetary EPs. Orion nebula is spectacular. setting the scope up outside for a while so it can "cool down" helps too.
If you think you've messed up collimation, I thought the same with mine but its more the problems when pushing the optic train. I cleaned my mirror and used a metal spacer when reattaching to keep the mirror parallel to the base and wound in the secondary flat against its mount (which is parallel to the primary), then carefully wound the adjustment screws in the same amount. Looking through the focus tube you can see when its centered. From there use the collimation screws to fine tune with out of focus stars. Then stop fiddling
Sad to say the Astromaster 130EQ is not much good for anything. The tube is great and capable so you could use it on a GOTO mount. I don't think its focus tube achieves focus for webcam imaging, but you could photograph through an eyepiece if you want to try but its not a good platform to expand upon.