Also, you say that J28PJ was using F/H mode on 17m - if your QSO was on the standard frequency of 18100kHz then it's almost certain that J28PJ was using the MSHV multi-stream variant of WSJT-X and not the genuine F/H mode. AFAIK the latter prevents its use on the standard frequencies.
-- Martin G0HDB
I checked my all.txt file. He was on 18095 not 18100.
