Thanks for the update, but, I returned mine yesterday. I was seeing the "grapes" in the lower settings also, and it was disturbing to me. I tried to convince myself for several days that it would probably be ok, but, I finally couldn't take it. Sumpin like that gets on my nerves.
When I went to Amazon site to get the return set up, I pulled up the TRS while there, and, there was a small yellow window there stating that Amazon was not selling them now. It seems that other customers had a problem with the inventory that Amazon was selling. But, some of the other sellers are still selling them now though. So, just go to Amazon & search the TRS & it will pull up one of the sellers with that info.