Heartless does bring up a good point about the idler brackets, though. If one is slacking, the other side would be taking up the slack in performance. This may cause damage to the carriage in the rod ports. Since the top portion of Lawsy's design for the right carriage relies on correct tension (and my theory of bearing diameter pressure), it may develop a crack over time.

check your Y idler blocks too - mine had cracked, creating all sorts of problems.

if you need assistance with printing replacements, just ask - or you could order some from http://www.printitindustries.com/collec … nted-parts

And there's no wires or anything getting bound up when it's near the back?
Then all I can guess is y carriages are so tight that the X rods are getting distorted from some strange pressure.  So how is the motion of X when it is near the back moving it by hand?
That or the wires or connections for the X motor have an issue when in that area.

I doubled checked and there doesnt seem to be any thing getting hit, pulled or bound up while it moves back.
When I move it by hand in the back it feels like same as I move it by hand in front. Same amount of resistance and feel.

One thing I noticed when I removed my whole X extruder/carriages, there was wiggle between the two Y carriages. Like if I just moves one Y carriage it can move 1cm back and forth and the other wont move. When I noticed this, I didnt do this aggressively incase I would ruin the carriages, but just something I noticed. Is that normal or bad?

Is there a way to make sure that the belt's teeth arent off?

Maybe you need to post a video of the X axis as it skips. 
A fan on the board that cools the drivers and a heat sink on the motor or even a fan will help.

Ok so I noticed that it only binds in the back thirds of the print bed. When I move it close to the front of the print bed it moves smoothly and not so much noise. but as I move it back, it binds.

Maybe its a over heating problem then? Sometimes, but very rarely, it will move okay in the center, but only about 3 or 4 times then bind again and only moves when I move it closer to the front.

If I can get my printer working long enough, the fan attachment will be top priority for sure.

That won't hurt anything.  The question is when you move it by hand, does it move smoothly?

Yes it moves smoothly and pretty easily, just as smooth as easy as moving my Y. and with the belts off it moves extremely easily and smooth. Much easier than stock, my stock use to need one hand holding my machine down when sliding or would move the whole printer. So its easy to move compared to that, but thats all I have to compare it with. haha

I hope you are referring to the grub screw on the motor pulley and not one on the idler pulley.

yes the one on the motor pulley. My idler pulley didnt come with a grub screw in it and I never put one in, because I read I didnt need it? idk haha

But here's a photo

You can see that my belt on the idler pulley side is higher. Could this be why I have constant binding problems?
I line up the belt straight, but as I move my X carriage left and right, one side will always move up and down. So Im guessing that one of the pulleys is just a hair at a angle? just a theory of course and not even sure if this tiny difference is why I get binding.

One thing I just noticed is that my X belt is not level between the two pulleys and when I move my carriage by hand the belt on the pulley (motor side) moves up and down by about 1mm or 2. The pulley doesnt move but the belt does. So Possibly this is why i have so many binding problems?

I saw the solidoodle Y belt leveling video (I couldnt find one for the X belt) but I applied the same thing about loosening it and moving the carriage left to right a few times to let the pulley line up its self, and thats where I tightened the grub screw.

Don't worry too much about your z rod.  If you can't see any wobble as it rotates then it's fine.  You can add a well nut to eliminate backlash if you want.

Ahhh ok I shall put that on the back burners and address that a bit later. I spent the last hour reading a few articles on retraction and will do the retraction cube test now and see how it goes! Then move on to looking up VREFs