That supports my theory. By setting the bias that high, you are increasing the load on the SMPS, allowing it to stabilize. You now have 1mA going through each FET, which is fine, as long as you are ok with the sensitivity of the Cortado at that bias setting. If you need to adjust the bias back down (for sensitivity reasons) then just do as i mentioned in the previous post and plug in a different condenser mic into another channel on the converter to add a higher load to the phantom power SMPS at the same time the Cortado is plugged in to the first channel.
Let me know if you have any more questions.
-Brach