Are you using a ferrite core on the power rails?
Yes, and im going to experiment with c’s
Yes, and im going to experiment with c's as well
Given the power level you’re monitoring I don’t think a swmode psu will make the slightest difference.
I’ve used swmode psus powering thermocouple amplifiers with 40uV/C input controlling kW of load with no problems
perhaps you could post an accurate schematic and layout of your project and we may be able to help you