First off, thank you all for the input on this little dilemma of mine!  It appears that a combination of every comment on here fixed the issue!  Here is how it all broke down:
I moved my tractor around to a couple of different locations and the result was the same, one side was almost 1/2 inch high.  I then started measuring a ton of different locations on the tractor to see where it might be off.  What I did notice right away is that the frame mount for the loader on the high side was indeed a bit high, but not high enough.  Per the suggestion of s219 I then loosened BOTH sides of the mount and put some pressure on the bucket, I then remeasured and the mounts were almost spot on!  I torqued everything back up and guess what....still 3/8" off.  Better, but now what?  I then lifted the bucket up a couple of inches and started measuring across my bucket and did in fact start to "gain" in altitude about 3/4 of the way to the high side but I could only measure 1/8" difference.  I then rechecked the air pressure and per the observation of EricTheOracle when I checked air pressure I wrote off the fact that the air pressure was within a few pounds.  I guess these tractor tires are not like car tires.  A pound or two does make a difference!!!:thumbsup:  Once I got the air pressure perfect I was within 3/16" and that seemed to be acceptable for my "mild" case of OCD!  
Many thanks to all of you for your input, and my apologies if my post caused a few of you to break out the tape measures for some quality OCD fact finding of your own!:laughing: