Actually I shouldn't. Their official MTU is limited to 1480.
When running a torrent, the VLESS connection to the server via Podkop is disconnected - thanks to this topic I found out my ISP doesn't wipe DSCP marks (at least bulk). It was not the case before. Also I found that not only they support 1492 (at least for IPv4) but mini-jumbo as well. PPPoE debugging shows that they still advertise 1480. Now I'm in the mood of poking them even more 