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Given that my 33uF Cout (C4) cap is already ceramic, is it really necessary that I use a 0.1uF ceramic (C7) for HF rejection? These designs assume that an electrolytic with high ESR is on the output so it is recommended to have a ceramic as well. Therefore, with price/size not being an issue, does it make sense to have a 33uF ceramic in parallel with a 0.1uF ceramic?
I also think the inductor may be the problem. How does it work at 1/2 power?
The IC turns on and off depending on the output voltage, so this frequency may be the source of the audible noise.
Have you tried implementing the I lim resistor? The lower current may help and would change the cycle time.