New to Bows - tuning question

[Walt]

I bought a diamond deploy with a QAD Ultrarest and the rest rubs against my quiver preventing the rest to operate properly.
What is the best way to fix this? Are there spacers I can get to extend the quiver out slightly?

Also, my peep sight (peep hole?) never seems to line up properly, how hard is this to adjust myself?

Finally, any recommendations on stabilizers? How much does length and brand matter? I will be using for hunting.

Thanks everyone!