I have a lower power driver than you, but the wiring looks to be the same. I'm using a Keling KL-4030 and a Keling 36V power supply which seems to have no issues pushing my 425 oz-in steppers. The wiring diagrams I got from Keling worked fine. Here is how I'm wired up:
ENA- No Connection
ENA+ No Connection
DIR- Axis direction pin on breakout
DIR+ +5V
PUL- Axis pulse pin on breakout
PUL+ +5V
My breakout board is a C10 by CNC4PC, which I purchased from Keling as part of my full set of electronics I got from them. So my breakout board side is quite a bit different than yours.
Like you I also have a dead pin either in my breakout or my parallel port. My did work for a little bit before stopping, which has me worried since I don't know why it failed. I haven't traced it yet, but a nice feature of the C10 breakout is the isolation chips are socketed so they can easily be replaced if I burned up a channel there.