When you’re using the Spawn emitter at location node are you using the the get actor location for the emitter location and get actor rotation for the rotation?
This should get you the results you want with having the emitter to spawn with you. If you look at the First Person Template and how the projectile is spawned you can get some offsets there.
If you’re still having issues be sure to post some screenshots of your blueprint to make it easier to diagnose and give you some feedback. 
Tim