I'm reading this right now , And you very well understand the vanguard mechanics!.
Healers are no problem unless they are inquistors who stun and run away and then heal.
Tanks - Yeah they are the biggest problem , They live long enough in my cases to call for help.
I Really have the most trouble with a Operative too , He has this insane opener and closer what deals 5k damage with just 3 melee attacks. If I get a starter on him or any other classes I get a dramatic advantage.
And If I had to suggest anything , If you ARE hardcore pvp player Biochem is like a must to be powerful , You Need Thoes Rakata stims to help you kick but. And yeah pretty much reusable health pack is insane , I have done alot of stuff with it , Pvp , Ops , Hardmode flashpoints etc.
Here Is something I would add , For all you tanks out there .http://www.torhead.com/skill-calc#801RRrrdoroGZMsr0oZb.1
Works great for me in hardmode flashpoints and ops as well as pvp.