Daniel,
Sounds like you have a few things going on in there....
Start by securing the secondary so it doesn't wobble about, then if you have a laser, check that the reflected laser spot hits the centre of the primary and doesn't move about when you move the scope around.
Depending on what you use for collimation, get the primary collimation done. I use either a barlowed laser or Cheshire eyepiece at the moment. Then move the scope around to check that the collimation holds while you do this. (Check for any movement in azimuth and altitude)
I have my spider/secondary set so that my laser spot will only move off the centre of the primary if I shake the scope and even then the movement is less than 1mm.
At F5 you will still see coma at outer half of the field (seagulls) without a Paracorr, this will be more pronounced with some eyepieces...
Your 10mm and 6mm eyepieces are pushing the magnification up to 225x and 375x and that will require the mirror to be cooled to ambient and steady seeing.
A 2" thick primary, if exposed to warm temps during the day, may never get to thermal equilibrium at night, forced cooling by fans will help but much depends on how fast the outside temperatures are dropping.
If you have a large fan (typically used inside house) and 240v available you can use that to cool the mirror much faster.
I doubt that the scratches would be the culprit to the extent you're describing, my money is on the collimation shifting, coma inherent in the optic at F5 and lack of thermal equilib.... The 'woolly' stars become smaller and smaller points as the mirror gets closer to ambient