Depending on how long it was frozen you should be good. If it just turned to slush rather than frozen solid the yeast should still be viable with no off flavors. My understanding is freezing the yeast will cause them to rupture putting off flavors in the beer. But if they didn't actually freeze...
Listening to that podcast is how I learned everything i know about brewing. I have Samsung galaxy and I use podcast player. The head retention episode is the 3rd episode
I listen to a podcast called brewstrong. It's hosted by Jamil Zannashef and John Palmer on the brewing network. And the consensus is a lighter OG really needs about 8ppm while something in the 1.065 or higher really need like 10ppm. That said Palmer states that while 8 ppm is ideal it's very...
I'm always for the experimentation side of brewing. If I'm not brewing for a reason I'm always trying something different. I say dry hop it. I would never dry hop in the primary, let alone during active fermentation, however.
Most yeast require 8ppm of Oxygen but that's very hard to achieve without pure oxygen. I always aerate by running my wort through a strainer then shaking the fermenter. I wouldn't use a paint mixer or drill set up. If u disturb the wort too much you will break up all the head retention proteins...
I always rack my beer over to a secondary to dry hop. The yeast will still absorb some of the hop oils. However, your process is yours to have fun with. I just want to get as much from my ingredients as I can.