Need Help! PSU for My Stepper Motors and Help abt new driver.

Hi guys, i have a few motors at home.

3 x KL23H2100-30-4B - 5.1V - 3A - 7mH - 382oz-in
5 x KL23H2100-35-4B - 2.5v - 3.5A - 2.8mH - 381oz-in

With this i want to build 2 machines.

So while i finish the frames i want to start building the PSU and to see if can get some new driver for the KL23H2100-30-4B to get better speed.

Btw, i think that will need

Machine 1 - 4 x KL23H2100-35-4B - 53V - 9.5A. So i can use the G540 that i own a few years ago.

So i can build an 50v - 9A PSU.

So question 1 is... i need to purchase 35v 450watts transformer, right? after convert AC to DC i will get 35v*1.414 = 49,49v DC


Machine 2 - 3 x KL23H2100-30-4B - 84V - 8A, i need other controller because G540 max voltaje are 50v.

Qustion 2 is... wich controller can i purchase?
Qustion 3 is... i need to purchase 55v 650watts transformer, right? after convert AC to DC i will get 5v*1.414 = 77,77v DC

well hope understand my poor english :)