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[JAZZCNC]

If i wait for someone to post the technical reasons, I probably wouldn't understand the post anyway.
I will go with the Nema 24 on the Z. for now.

I'll give it in simple Technical terms. Large motors have more Inductance or think of it as Resistance to flow of current thru it's windings and Current gives us Torque.
Then think of voltage as the force pushing current thru the motor windings.
So with higher inductance you need more Push to achieve the same speed as motor with lower Inductance. Then because torque mostly comes from current and your struggling to Push the current thru the windings then Torque is also lower.
Think of it as trying to drive a manual gearbox(don't think you have many of these in US . .Lol) Car Slow in too high gear!! Because your speed isn't enough then Motor stalls.

Now you have the worst mix match of components because Nema 34 motors have high inductance but you have Low voltage. Made worse by Drive/s that don't allow higher voltage and like has been said your very lucky you haven't fried them already running so close to there Max voltage.

Unfortunatly it gets worse when it comes to speed because you have high friction linear components in the form of Lead screw and Skate bearings.

This translates into Driving Car Slowly in high gear with the brakes Sticking and the end result motor stalls at lower speed.!!