It needs tough love. Tell it to quit pisang its time away.
I had a DC that wasn't growing for the longest time. It lacked a watering basin, so I made one, and that allowed me to give it much more water, and it took off. But you've got irrigation and damp soil already, as you mentioned above.
Maybe cool soil from the shade? (but if so, I would still expect some growth)
Maybe it died back in the middle when you transplanted it?
I'd probably get frustrated with it and start hacking it back to verify the core was still alive. It might have a dead black center. I've had banana plants that didn't grow for months, and when I eventually starting whacking them back, I found that their centers were black. After cutting them back until I got to all green, they started re-growing almost immediately.