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Hi Vin,
The cover with the hole in it for the 12" is useless. (read thread 'Hartman Mask'). The hole in the factory cover makes it an f23.
The shimmering waves are a combination of horizonal atmospheric distortion and mirror equalisation. I have the same scope and find that if I turn the fan on 5 mins before viewing the mirror equalises. As for atmosphere, wait until about 10p.m. for the start of excellent views of Jupiter.
In your 12" with the 32mm you should be getting a lot of bright green in Orion Neb! Maybe you have a light pollution problem.
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