Flattening Concrete for Dricore Product Suggestion
I ended up using a product from HD by custom building products called SpeedFinish (for about $16/box).  It is a portland cement based compound designed to level floors.  The box says it cures in about 15 minutes. In reality it took a few hours before it fully hardened.  I was able to build up the low spot of the concrete floor (i used 3 10lb boxes). I was able to get a nice smooth feather finish and the product dried rock hard. My thinking behind this was that I no longer need to shim that area, the dricore tiles felt very spongy if they were shimmed out pretty high.  This completely eliminated the issue and my floor feels great. I also dont care cosmetically because the dricore will be hiding the patch job.  Also, if you go this route some advice is to buy more speedfinish than you think, one box does not cover a lot of area, especially if you are trying to raise it up about 1/4" like I was.