Yup... the free upgrade is where I would start.

Speaker positioning, and better understanding of room acoustics. If you've really got the bug... learn how to use REW with a good quality, compatible calibrated microphone. Then you can track the effects your changes make... toe in, symmetrical placement vs asymmetrical, standoff distance, distance between speakers, distance to LP, etc.
As
@Pogre suggested, this was a very fulfilling pursuit to me, and I still have a significant path ahead to travel down... though I'm pretty good where I'm at right now.