I'm currently in the process of updating our server to 1.10.2.

Forge-1.10.2-12.18.3.2254
forgeessentials-1.10.2-10.1.113-server
EngineersWorkshop-1.3.2-1.10.2

This is my first time setting up a forge server, up until now I've only set up forge/bukkit servers so I'm trying to learn how to server admin with just mods.

I've decided to move to FE to replace bukkit essentials in 1.10.2 but i've run into a conflict with FE and engineers workshop. I'm not sure if it's even possible to fix this on the server. I'm wondering if it's a fakeplayer issue.

Right now the only way to start the server is to remove FE, but I'd really like to keep it and Engineers workshop on the server.

crashlog

Update Forge Essentials. That bug has already been fixed.

That is the latest 1.10.2 file version available on curse and Forgeessentials.com, forgeessentials-1.10.2-10.1.113

This bug was fixed in build 115
Make sure to go to Jenkins to get the latest builds.
http://ci.forgeessentials.com/job/FE-1.10/

and if I try the experimental builds and find a bug am I going to be told I should only use recommended versions?

See the Readme
Specifically the part about reporting bugs.

Reporting bugs

Please follow these rules when reporting bugs:

• Update to the latest build from Jenkins before reporting a bug.
• Check, if the bug was not already reported by using the search.
• Always attach logs to your reports if you encountered crashes.
  If the client crashed, please also attach the client log if possible.
• For feature requests, we recommend asking about it on IRC firs.t

Finally, as an additional note, Forge Essentials for 1.10 is still in an unstable state. At this point in time, the latest Jenkins build will almost always be the most stable version