as you know several countries are allowed to operating on 60m band with their new preliminary WRC-15 band allocation. In order to keep all hams well co-operated worldwide I would like to kindly ask all of us well understand also the other ITU-Regions and National band allocations and respect each others...
An interim bandplan was adopted by IARU Region 1 in April 2016, for the WRC-15 allocation (5351.5 - 5366.5 kHz).
Always the best way is to double check if the frequency is really clean and even better is to avoid using these channels for JT65 modes if there is chance to use another one instead.
Please understand that there are still countries with channelized 60m band with no way to move out in case of QRM compare to WRC-15 band VFO-based allocation.
73 - Petr, OK1RP