Mondays are normally not crowded, Firehawk pretty much always has a long line, (at least when I've been there). Vortex normally a 20min wait and Flight Deck is normally a very short line. Beast at night can get lengthy, but it just depends.It varies everyday. But remember these are just estimates, it mostly depends on the weather and some other factors. And yes Beast at night is spectacular! I also like DB at night too. Might want to try both.
Hope you have fun, and what your looking at, the lines shouldn't be that long.
Please correct me if something sounds incorrect.