and a JR RS310 receiver to go in my 1/12th when it arrives. I hooked it all up with the Esc just to check if it goes and I'm wondering is it normal for this servo to twitch/glitch (make a gear noise, or whatever you want to call it lol)?

The output isn't actually moving much (barely perceptible) but it sure "sounds" like it is.

At the moment servo travel is set to 100% and it does seem to ease off/stop at 70% or less but I just tried my previous standard size servo and not even the slightest sound.