GRBL settings help with TB6560

I sat down today to try and GRBL configured properly for my drivers and motors. I think I made some progress, but I feel like it should be smoother and have less vibration than it does.

Here are the components I am working with:
Motor:
200 steps/rev 2A
https://www.sparkfun.com/products/10847

Driver board:
SainSmart CNC Router Single 1 Axis 3.5A TB6560 Stepper Stepping Motor Driver Board
Amazon.com: SainSmart CNC Router Single 1 Axis 3.5A TB6560 Stepper Stepping Motor Driver Board WL: Everything Else

Everything Else
Arduino UNO+GRBL 0.8c



Here are the settings I began with, followed by my actions and notes:
Driver Board-
Current max = 2A
Stop Current = 50%
Microstepping = 1x
Current Decay = 0

GRBL-
$0,$1=3.281
$3=30
$4=750
$5=1100
NOTES=Lots of vibration, very loud, sounds like stronger and lower pitch version of "Wheel of Fortune Wheel"

$6=0.1 ->no change, changed back to 0
driver board current ->change to 1.6A, no change, changed back
change to half coil wiring on motor->no change, changed back to full coil
$1=6.562->faster, but still vibration
$1=13.124->more of a "whining" at high speed, still vibrates lots
$3=3->no change, changed back
driver board current to 1A->little quieter
driver board current to 0.5A->quieter
microstepping->2x, much quieter
$1=26.248->seems better, still has some vibration
driver board current to 1A->vibrates when accelerating (at start and end of moves)

I will see if I can post a video, but any thoughts in the mean time?

Edit: Here is the video link, Sorry the sound is very low:
http://www.youtube.com/watch?v=QkdLb...ature=youtu.be