I love the chat too, but am terribly flaky about multi-tasking while I'm on there and sometimes go into perma-lurk (sorry).
SQUIRREL!!!!!
No day preference for me due to having almost ZERO schedule in my life, but I DO very strongly feel that setting a "focus" chat night helps pool folks in, and especially, gives better odds for newbies to connect with others in real time.
My instinct says go with Tuesday or leave it on Wednesday, it's the "back to work" relief. lol