Not sure it's getting the right hashrate for JCE. My R7 1700 will show 508 H/s average in the JCE window, but the benchmark saved 444 H/s. Same with my i5, save 80 something, actual hashrate was 170.
Stop MM
delete stat file cpu-jce-cn-0.29e.txt
change cpu-jce-cn-0.29e.config.txt file. set BenchmarkSeconds to 30 or 90 sec
start MM
press y
please write what time more accurate bench speed