Sorry, reading comprehension fail.
Not very familiar with what mods are available in Legends, though it I do know it lacks all my favorite mods for items and fluid transfer.
It does have Bluepower, and that mod has fluid moving blocks. Try that one and see.
Usually you don't start servers by clicking on the .jar file. You use a start.bat your launch.bat (or .sh if you're linux). This file is needed to allocate more memory to the server, among other things.
It looks like you have Forge for 1.8, and you have lots of mods for 1.7.10. Get the right forge and try again.
(from the log) Forge Mod Loader version 11.14.4.1577 for Minecraft 1.8 loading
Many mods pipes support a "round robin" mode. I think TE itemducts do, enderio does as well (may need an upgrade, I forget). What pack are you using? If you must use BC, perhaps some sort of gate would help.
My updates usually take a few minutes, and I need to close and re-open the launcher, then click to to launch my pack to be prompted to install the update. Maybe there were some temporary site issues.
Removed Simply Jetpacks, causing odd issues. Plenty of other ways to fly. Try a tricked-out Rotarycraft jetpack with jet fuel in it. Fastest way to fly by far.
It will be free for a couple days, starting tomorrow. If anyone who is interested could grab one, take a look, and leave an Amazon review, that would be awesome.