That is a nice test you did.
I just tested a buck converter with the Maynuo, 12V input, 18V output at up to 15A
During the test, I went up to 50 updates/sec. and was surprised, how stable the Maynuo was.
Absolutely amazing!
In contrast, I also have a BK-Precision eload and that one was only stable up to 10A.
And the BK-Precision instrument was twice as much $$