I find the tier bonus really bad.
The shield on tanks (Noe the main target of that spell) usually broke really soon by damage, specially now that our mastery doesn't increase it. So the heal increase is anecdotic.
And the second... Well, since the main target of shield are the tanks, on bosses with great tank damage you will put the shield on CD, so not really great thing.
Also find funny a tier focus on shield since now the main of the disci changed..... Strange and odd.
Also a shame the plea change. No other healer have a cost increase in a spameable heals