My server host offers 1388 as of today when I checked. I stay on the fence about it because I am currently using forge 1395 and its really smooth despite having a large number of mods. Since the liquid fix and whatnot, I personally want to wait it out a little more because major technology mods are still adapting to the new forge the best they can. I have never mixed and matched diff forge versions with cauldron. I know that there is forge and there is cauldron. Cauldron includes plugin and mod support. Cauldron is server only. In the past, I always had the falling through the world issues with attack of the b team. Since then, I just deal with mods for forge server after an unofficial of cauldron version did not work well with the custom 1.7.10 pack I put together. The forge only did work fine, so that's what I am sticking with atm. I would love to return to cauldron server, but it is just not stable enough for my taste. If you got something working fine, you may want to stick with it in my opinion.