when you end up in a recovery fix after redsn0w restore, you need to enter dfu mode and jailbreak with the same resn0w while pointing to the 6.0 ipsw.
When is redsn0w coming, Cant update yet because of baseband preservation. Is there any other way to create a no BB ipsw?
Are yer sure your phone downgraded successfully?, coz what you are describing are the symptoms of the ipad baseband. (signal dropping when location services are accessed)
did you check the sim slot for dirt or something
why are you booting tethered when there is already untethers available....unless maybe you are on iOS 6
how did you confirm its not working
Thats expected dude. the fix cant be exact indoors because of obstructions to the signal