I'd also like to report low power output at both 5GHz and 2.4GHz on my WHW03 v1. However, it's not just that, the Rx sensitivity of the radios is pretty bad.
Curiously, the 2.4GHz radio reports a noise floor of -103 dBm, which is unusually low, I have another AP here and it reports -95dBm. None of my APs have ever reached that low of a noise floor. Maybe there is an attenuation in the Rx path?
Could it be that there is a FEM controlled by GPIO that isn't enabled currently? That would explain the lack of sensitivity as well as the lack of power. There is a documented case here: Asus map-ac2200 low transmit/receive signal 5Ghz - #11 by slh
I took a glance at the source tarball from Belkin and there seems to be nothing obvious.
My unit has a black PCB, just in case this matters. At a glance, it looks identical to the unit shown on the FCC pictures.