I still use Seroquel but I hate the need of using it. I need it so I can sleep properly, however, I do get drowsy all day long. The pill I use lasts almost 24 hours, so I'm going in an opposite direction by chewing them hoping to get affected for a shorter period of time.
In your case, I'd recommend XR tablets, not generic. It's strange because I have used them for quite a long time and haven't developed any tolerance whatsoever. Not 10 years like you, but 6 and 200 mg still makes me extremely drowsy and very tired on the following day. I have also noticed that there are generics that differ from the original Seroquel medication. I think they are not as strong as the original drug. Maybe it's only me idk.
Also, one of the reasons I do take Seroquel and not Benzos in general is because I was told that they are not as addictive and does not build tolerance as quickly as benzos do. As I mentioned, I have never detected any sort of tolerance at all.
Why do you need to use it? I can't imagine using this recreationally.