Replacement Wahoo KICKR power brick

We lost our Kickr power brick/cord when we moved back into the RV full-time.

I plugged in a 15V 3A cord that fit from a ‘Neewer’ branded studio light.

It’s working, but it feels like we have to ride at 20-30% more watts than our computer is telling us we’re actually riding. Can anyone explain this? Wife still has 3 hours to go on a trainer ride.

As in, trainer at 150-160W in erg mode feels like 200W (or maybe more).

Here’s the cord we’re using:

from:

Here’s the spec on the Kickr replacement cord:

Finally, dozens of options on Amazon for replacements; all look sketchy. Recommendations on how to choose?

Or is there another site with OEM replacement that’s not out of stock?