After Effects :: How To Add Color Adjustment To A Mask

im trying to make an adjustment to one section of my footage.i followed other instructions elsewhere about making a mask on a solid and then linking the solid to a null object, which has tracking footage (i was thinking i could motion track a mask?)
 
so i did that, but tracking motion doesnt work, the mask moves everywhere so i went in and moved the mask points at keyframes, which was annoying. but now i can't add adjustments to the solid where the mask is. i turned the solid into an adjustment layer but adding color correction adjustments doesn't work.
 
i have to use after effects by the way. basically tl:dr i need to color correct one section (or the masked part) of my footage. how can i do that in AE?
 
also is there an easier way to motion track something that goes completely off screen or out of the comp window? cause its a handheld shot and theres like a pan, and im trying to track the mask but it doesnt really work or stay around the area it needs to.