Jyowan - you're missing a very critical point here.
The accuracy you see when you open your character sheet, by default, is MELEE accuracy. It applies only to melee attacks, of which you have 2? maybe 3?
The vas majority of your attacks are FORCE. There's a different accuracy for that. If you are at 100% melee accuracy, then you are at 110% force accuracy - which is what the guides are talking about and what you need as an assassin.