Thanks for the insight Pavel. If you go to the Boot show will/can you take a current Subtronic flash (Pro 160) and test its TTL-functionality on this board, pleeeeease...
I already did such test at previous exhibition at Subtronic booth. Yes, that TTL board worked with Subtronic strobes, but firmware required some adjustment. The good news is that In March/April 2018 the TTL-converters firmware will be officially updated for Subtronic 160 strobe support. So, you have to wait a couple of months, and everything will be Ok.
Subal V2 and V3 boards (Nikon TTL) are almost the same, the difference mainly is in switch type. V3 board has rotary switch, V2 has DIP switch. But functionality of both boards is almost the same. Supported strobes: Z-240, YS-D1, YS-D2, YS-250, DS-161, DS-160.
Subal Canon TTL is new device, interesting product. It has very wide and handy control possibilities by Canon camera menu.
Both new boards (Canon and Nikon) have 10-position rotary switch, its appearence tells us that more new strobes may be supported this year.
Hugyfot now supplies housings with TTL trigger and new type optical bulkheads, which are purposed for LEDs usage. Optical TTL works fine there. Just ask Hugyfot to send you a pair of new bulkheads and TTL trigger. You can easy install them by yourself.
Also pay attention to your optical cables. YS-D2 strobe has very low input sensitivity. For reliable TTL with YS-D2 better use only 613 core fiber optical cables: Nauticam #26216, Sea&Sea #50128 or #50133, Howshot 613L.