Last time I was on 95 in Miami the express lane was closed. This was at two or three in the morning, though, so don't take my word for it. I don't live down there. I was just, uh... visiting. :D
The bottom line on Miami traffic is a simple one: there's no way to avoid it. So my advice to the OP is also simple: resign yourself to it and plan for it. You'll be much happier. If you expect to be able to do 10 things and get to the stadium at the last minute if you use the perfect route all that will happen is that you will end up purple faced with rage.