For the melee type trying to get the positioning where you can hit these bosses, I created an AutoIt3 script that will do the job nicely (ie, no fat fingering the spacebar). Open the AutoIt script editor, paste the below in while you have Warhammer open, fly below the mob of choice, then start this script. When you begin swinging and not getting hit back, hit ESC to terminate the script. You may then button mash as you see fit.
Code:
#cs ----------------------------------------------------------------------------
AutoIt Version: 3.2.4.9
Author: asayama10
Script Function:
when flying directly under a mob, use this while spamming an ability to get the positioning
where you can hit them but they don't hit you.
Hit ESC once you start swinging to stop this script.
#ce ----------------------------------------------------------------------------
; Script Start
WinActivate("Warhammer:")
Sleep(2000)
HotKeySet("{ESC}", "Terminate")
While (True)
Send("{SPACE}")
Sleep(1200)
WEnd
Func Terminate()
Exit 0
EndFunc