3 - Why are you serving ga.js from your domain? If you use the standard Google domain it will probably already be in users caches.
I noticed the cookie issue resolved themselves a little yesterday while moving some items to a CDN. However it seems as the things are not as smooth from the CDN as they were when everything was hosted in one group. That could be my imagination though.
I’ll take a look at issue #1 shortly. I am not really clear on it, but may be once I actually pull it up in front of me.
For issue #2 I have pretty much done this on all the pages that I can that don’t seem to hose things up in my eCommerce area.
#3 To be quite honest, I was told it would speed things up in general and did seem to cut back some on the load time. I would be happy to add it back the other way and rerun to compare though.
Looks good (and yes, you did get the conditional comment fix correct). Don’t worry about the score, it doesn’t necessarily correlate with performance and is generally a list of things to look at. Far more important is the actual performance.