Acoustic Treatment Newbee

I have my first (mostly) dedicated listening room, but it is kind of quirky and I'm looking for some advice on determining an ideal set up and figuring out what acoustic treatments might help.

The room:

Roughly 11 x 24. The front of the room has a set of bay windows. The back of the room is all brick with an unused fireplace. One wall is nearly all windows, the other is all shelves. Pretty much a study in opposites. Ceiling is pretty tall--9 feet or so.

The current set up:

I currently have my system set up in the front of my room. My main speakers are Zu Druids, which seem a little big for the room, powered by a Jolida tube amp. The Druids sit about 2 feet in front of the bay window 'shelf' and about 15" in from the side walls. Listening chair is about 9 feet in front of the speakers.

I would say that the sound is inconsistent. Frequently the bass sits well above the speakers, somewhere near standing height, when the music is dense. In less dense music, the bass comes through more consistently but the highs and mids are a little less cohesive.

A few questions:

-Should I think about moving my system to the 'back' wall (basically in front of the brick)?

-Clearly I need to do something about the run of windows (I'm thinking a panel or two). What about the run of book shelves?

-If keeping the system in the front of the room makes the most sense OR if I'm moving the system to the back wall, where do I start with room treatments? Behind the speakers? In the back corners/walls?

-How useful are test cd's and/or lp's?

Thanks