How can I make Unity5 lighting work with these assets?

I'm immensely excited by my experiments with Unity5 and PBR, but I'm having real problems trying to get environments or levels to display as I intend them to.

My current project involves a simple comedy club environment, which I intend lighting with multiple spot lights hanging from the ceiling. The light should splash off the red surface of the floor and softly light the lower portions of the walls, leaving the ceiling mostly in darkness.

My target is something close to this:

This is the mostly unlit room in Unity 5...

...and this is the room with the lighting baked. It's super dark, with a strong blue ambient light. This is not how I intend the level to look - the unlit image above is somewhat closer to the look I'm going for.

I'd prefer to make most of these lights non-realtime and non-shadow-casting (except for the lights pointed at the stage), but honestly I'd be happy just to figure out how to get the lighting up to something like the first image in this question, realtime, mixed or baked.

I've read a TON of documentation on U5 PBR and Enlighten, I've done a LOT of experimentation over the past coupla days and... nope. I cannot get this to look right. Can anybody help? (Unity package follows)

https://www.dropbox.com/s/425ump9yqytoi2t/u5lightingProblem.unitypackage?dl=0

The current build target is Android (a Nexus 7 tablet).

My computer is a cheap Dell Inspiron 3531 laptop, running Windows 8.1, with Intel Celeron CPU N2830 @ 2.16GHz with 4GB of ram and a x64-based processor. For Unity4 it was just tickety boo for building small projects and going to gamejams and it looks like it'll be mostly good for 5 if I leave continuous baking off.

Seriously. At the end of my tether here. What am I doing wrong?

--Rev