If you want to fly pattern with that plane you need it straight unless you want to have to compensate for a bent airframe. If you just want something to burn holes in the sky with don't worry about it.

Seriously, you have a new plane arriving Monday that will do the Sportsman sequence. The best thing you can do is burn fuel practicing. If you don't want to compete with the Decathalon then get another low wing plane or find someone who can break you Dolphin's tail off an put it on straight. I doubt anyone will tell you that the Decathalon would be inapproiate for Sportsman. Go practice and have fun. If the bug bites you (and it will) save up and buy a new plane for next year..

That's just my $1.98 ($.02 adjusted for inflation)