Guild Wars 2

So i have been trying to make a ranger build with as much protection up as possible.

I tried to mix and match 3 sets of Runes at 2 apiece.

Grove 2 piece gives 15% increase to protection duration
Earth 2 piece gives 15% increase to protection duration
Monk 2 piece goves 10% increase to all boons

I also spent 30 points in the trait line that increases boon duration for another 30% increase to boons

So do all of these stack? If not, then what happens?

Do i really have 70% increase to protection?
My simple tests seem to show only that the 30% from trait line is affecting my protection boon.

Thanks for any help in understanding how this works.

also my Blue Moa shows in tool tip that he provides a 4.5 second protection, but it seems to only be a little less then 3ish ?