From another builder:
Yeah, unfortunately I don’t have configs to give you either, since I haven’t tested it with full power yet. It is possible to tune the saturation compensation, try 10% or 15%. You can also try to increase FOC observer gain. Some people had luck with 30->60.
Benjamin also noted in the VESC forum about their 75/300:
“One known issue with the 75/300 is that is measures the flux linkage too high on some motors. Try decreasing the flux linkage with 5 - 50% and see if it helps.”
https://foil.zone/t/has-anyone-successfully-used-the-flipsky-fsesc-75200-with-the-fs65161-motor/12052/8