Nice work
You can increase the voltage to 52v if your power supplies will all balance this will give you a little more RPM I mostly run my old Dyn2 Drives at 50v just adjust the power supplies they all must be the same and in balance
The new Dyn2 drives I have them at 68v to 72v depending on what Power supply I use
Dyn4 if you want / need max performance though