You play 3 of the best classes in the game...I always hate to say this but L2p perhaps.
If this is going when im sober in the morning ill provide detail.
What he said.
You know nothing about any of those classes. My sniper destroys PTs, Juggs and Maras. If they get close it becomes dicey but you have to tools to deal with it.
There are no 30m stuns anymore, only 30m mezzes that break on damage. Longest stun range is 10m now, if anything that should HELP your 'Slinger.
Pro tip: if you see a Mara run towards you and pop stealth: drop a XS Freighter Flyby on yourself and get ready to pop dodge when they start to Ravage.