On going chinese 6040 problems

[JAZZCNC]

Ok well I'd forget Roy's System 45 as it's no better than that kit from Ali express.

First the Aliexpress Kit is a USBCNC Motion control card with BOB combined. This means you'll have to use the USBCNC control software not Mach3. This is not a problem just making you aware.
The fact it's Motion control card will take away most of your Pulse issues in one go.

Regards the Motors then those listed are 4 wire but it doesn't say if they are series wound or parallel, I'd guess at series given the amps and inductance. The more common 8 wire Hybrid motors can be wired either way but with 4 wire your stuck to what the manufacturer winds them.
Being series wound means they require much more volts to get any resonable speed from them. Motors wired in series give higher torque at slower speeds but quickly run out as the RPM's rise. This is why the 36Vdc isn't really man enough for these motors to expect any speed from them.

The Kit drives can take upto 50Vdc but again in practise you need a safety margin. The reason you need a safety margin is that steppers effectively become dynamos when de-accelerating and this energy gets passed back to the drives and is known as back EMF. So if you run at the drives Max voltage you will damage them.
For this reason running lower voltage is recommended. How much lower does depend slightly on the power supply type. Regulated Linear type supplies need to be run at lower volts than toroidal type supplies due to how they handle returning current. It's for this reason why Unregulated supplies are prefered and in particular toroidal transformer type due to the capacitors better handling returning power. Toroid supplies can be run closer to drives limit.

The drives in this kit are 50Vdc max so I'd run them around 42-44Vdc with an Unregulated supply. This will give the motors that bit more voltage required to cover the higher inductance. Still not ideal but better. 70vdc would be much more suitable but your drives wouldn't be too impressed. . Lol

Now personally I'd just think about changing the PSU for toridial supply which are very easy to build or can be bought and run the drives at 44Vdc. This will get you going at Ok speeds and will be good for learning without costing a fortune.