Originally Posted by SScnc 
HackMax and Khalid, Thank you both too, I feel I will have to upgrade to a higher torque stepper at least for the Z and I still think my Keling PS isn't putting out enough amps, maybe a switching PS isn't as good a choice in this application as a transformer based one is. (???)
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What is the size of the z stepper you have now? As a matter of fact what are all your stepper sizes out of curiosity? My X3 I just converted has tons of torque on the 425oz steppers on x and y and the z I haven't really determined yet. I need to grip the wheel quite firmly and that is when the axis is rapiding (which is probably when the motor is weakest.) I remember reading something somewhere about the switching power supplies not being the best choice for certain applications and it swayed my opinion on using one even though it was the cheaper route. I purchased a 39v 10A power supply from Antec on eBay.
The problem with your setup has one key clue that I can see with the info you have given and that is it worked fine before and now it doesn't. That tells me something out of the norm has happened to cause your problem. If you made no settings changes or tweaks and all three axes are weak when they used to be strong then something else has changed. It also tells me your power supply was probably adequate before your problem. Did you notice any large amount of heat generated from it at anytime? Maybe you were over-driving it and its starting to give out?
Rick