You definitely need a buck driver for the XML setup, I know that the MTN max series from mtnelectronics.com are a good buck drivers.
They also have Fet (dd) driver. Both with the requirements you want.
This one for example:
And this one:
For the XHP70 you could also use the LD-3 driver:
LD-3: LD-2 on vitaminS (2-12Amps CC with configurable UI).