Hey xadine just some thing we picked up on from our raids if you have warriors ressing team members it can also boost their toughness to 1400. So your tank needs to be over that to combat that issue. I have gradually over the weeks dropped my toughness as I've gradually got a second gear set, but the first week I just ended up stripping of a couple of my trinkets to drop me lower than the tank.
Also double check both weapon sets I know when I weapon swap my toughness goes up in comparison to when I'm healing on staff. That didn't cause an issue at all on one of our earlier raids when I swapped to give some extra dps buffs... nope nothing to see here nothing happens at all... like vg suddenly following me...nope didn't happen at all
That said I can also use that to my advantage. Occasionally go keep the green guardian busy on the splits if there's no one else to deal with him that day. When on staff he takes one look at me giggles and runs off towards the blue guardian. I found weapon swapping and boosting my toughness to just over 1300 generally keeps him in place long enough for the others to deal with blue and then I can pull him over. So his agro threshold seems to be somewhere round 1300 toughness
Hope that helps you guys because it confused me for a couple of attempt the first time I was pulling him.
Good luck with your first raid next week will keep my fingers crossed for you.