When I first had my 5000's, I hadn't listened to fine stereo in quite awhile and naively placed them near my wall (glass windows actually) towards the corners. I thought they sounded great of course, not having had a reference point for many years. I upgraded some components and following mapman's suggestions began moving them out from the rear windows and in from the corners. Now that I have them where I want them, I've reached a point of supreme satisfaction such that I don't wish to move them further. It's hard to explain in words, but when one reaches the correct placement it's a bit like discovering resonance; that is, you suddenly say to yourself, now THAT'S sweet. I find that I forget about right speaker/left speaker as it becomes completely irrelevant.
As to you setup, become comfortable with what you have for 6 months or so before changing or upgrading components. That way the previous experience will be well drilled into your memory. For me, adding a more powerful amp helped the low end, but these are 5000's and yours may be quite happy with what you have. The other big, big difference for me with vinyl was adding a step up transformer to the MC cartridge before feeding into the MM input. It just revealed the bass in the vinyl. Oh yeah, the speaker placement helped with that too.
As to you setup, become comfortable with what you have for 6 months or so before changing or upgrading components. That way the previous experience will be well drilled into your memory. For me, adding a more powerful amp helped the low end, but these are 5000's and yours may be quite happy with what you have. The other big, big difference for me with vinyl was adding a step up transformer to the MC cartridge before feeding into the MM input. It just revealed the bass in the vinyl. Oh yeah, the speaker placement helped with that too.