Sunday to end the weekend I definitely won't be partying on sundays! but this would have to mean the livestreams would be early enough so that i could sleep at a proper time which would probably be slightly earlier than your usual streams.
Personally, I don't think you should set a specific time or date for all your streams. I just think it adds extra stress to artists and isn't needed.
Look at your own schedule, see what you can do and maybe notify your watchers a day or so in advance if you can. This way they'll know a little ahead of time when you plan on streaming.
I know most of the time you randomly throw out a journal entry saying your streaming, but it causes a lot of people to miss out because there wasn't any advance notice. Even saying something a few hours ahead of time would be really nice.
Seeing you stream more often would be nice too but it doesn't have to be every week. Some artists like to do that, some don't. However, may I recommend that you record your streams more often for those that are unable to watch? I know you record some of them but this way, if say Sally and Jack didn't get to see it live, they can just watch the video later and not feel so left out. : )
For me Saturday would be the best day: ideally, being able to watch your stream on Friday would close the working week pretty nicely, but you're on a different time zone to mine, so you might end up streaming in the morning or at any other time when I can't watch the stream. Sunday would be a no-no, too, because if you streamed very late, I'd be wasted on the following Monday. Saturday, on the other hand, is usually a free day and even if you were to stream late, I wouldn't have to wake up early on Monday.