You will get much lower jitter from the disc if you apply a rubberized coating to the surface, leaving the chuck area exposed.
I used to do all kinds of mods to disks to improve jitter and readability, including treatments, light exposure, de-static, pens etc.. The most effective thing you can do is to treat the disk with a good treatment and coat the top with a rubberized coating.
I made a jig using some thin card stock to make a mask that covers the disk in a spoke pattern, exposing most of it, except for the outer edge and the inner hub that the chuck must engage. Spray the coating on in layers and then remove the mask and let it dry. Try hobby stores or Home Depot for the coating.
You will be amazed. If your CD transport uses a platter instead of a chuck, this is not for you.
BTW, I dont bother with CD's anymore because computer and server audio is so much better, as well as being more convenient.