Okay it sounds like i am on the right track at least. Most of my OGs are 1.100 or higher but i realized i have been skimping on the oxygenation, which is probably why my attenuation isn't as high as it could be (I just read the "How to brew a BIG beer" article, it is great).
Maybe i will increase the number of times i pour the wort back and forth. Gives a good workout too
Also, i used to be into reef keeping and i remember that cooler water will hold more CO2, but i didn't know it was true with all gasses. That explains it well.
I have never tried the air pump, but i have several. Another reef keeping note: When i used to raise phytoplankton we used hard airline tubing attached to flexible tubing to oxygenate the jars. Airstones can harbor bacteria and are often only fully sanitized with a pressure cooker. The hard airline tubing makes relatively small bubbles and is easiest to clean; plus you can get a bigger pump and a gang valve and split one tube into four or eight. You could just use flex tubing but it is hard to manage.