Try also adding a second insole, it will make it snugger, with the second pair of socks. I do the same thing, buy a half size bigger and practice in them as they area little bigger and clunkier, then play matches in the proper fitting shoe and then I feel perfect and a shade quicker and sharper with footwork.
Anything for a lil mental edge helps )
"He looked like he was trying to imitate Sampras when I first played him." Agassi in Facing Federer