I feel for you, we all have days like that. Frozen weed, I'd put it in the berley but wouldn't use it as bait.
Persistant downs and no fish I would usually put down to small fish. If you do hook one you're lucky if they are over 12cm. Then again if they're stripping the bait too it could be black trevally.
If the small move doesn't pay, the fish aren't there. Make a big move. Don't flog a dead horse. You could be surprised at the success you get at a totally new spot.