I have played rugby on and off for several years now. I too have usually struggled with my sugars during games. I used to eat a PB&J sandwich and drink a little gatoraide about 30min-hr before playing. needless to say my sugar was through the roof by the time i finished.
You should be carful of working out when your BG is high since exercise will just elevate it further.
Check out this site. i have used info provided here and it has helped greatly in managing my exercise and diabetes. Mainly I attempt to be at a normal BG before starting. Depending on the situation I may eat a small snack and only take 1/2 my normal insulin about 20-30 min before starting. About every 30min - 1hr of moderate to intense exercise I will consume a few glucose tabs or a powergel to maintain my BG and energy. This has worked really well for me, you can definately tell a difference in your energy while working out if you maintain good control (avoiding both highs and lows). I am getting ready to go onto the pump so we will see how things change, it should be simpler while at the gym, but on rugby days, things may get more complicated.
http://www.runsweet.com/4554.html
