curling and bad bead in the back

Sounds like it.

That was definitely the problem.  I used the sheet of paper as a feeler gauge.  I could get all the edges good, but everytime it would go to the center it was too close.  Sounds like its warped in the middle.  If I use a piece of glass, how do you affix the glass to the aluminum?  Do I remove the aluminum tray and place the glass on top of the heater board?

Watch you fingers when you adjust the screws.  I have blisters on mine from doing the process several times to check for accuracy.

To attach your glass just leave the kapton on the bed and spray your glass with aqua-net (both sides) it should stick to the bed after a couple of heat cycles.  You can clip it into place but then you run the risk of your glass warping and causing the same problem.

If you use the cheap hardware glass and clamp it down it will warp to match the warped bed at least until it breaks.
That being said I have used the same cheap piece of glass since my printer was new almost a year ago.  It doesn't move during prints and I can see the warped bed underneath.  The hairspray just kind of acts like self leveling glue.  I came up with this after I warped one with clamps.