At 52 you do have a more limited toolkit, but generally:

-Whether you can Regen the tank or not while making a pull depends on the tank. Some are good at hitting each mob as they go, so Regen aggro isn't an issue (and if do you get a stray mob on you just Regen yourself too and follow the tank as usual). Other tanks pull by simply running past the mobs and are unsafe to Regen. You get a feel for it as you go. At 66 you can Divine Benison pre-pull.
-DoT any mob your tank has hit with Aero while running.
-As the tank approaches the wall, Swiftcast while running then Holy when the tank stops to catch everything in an instant 4 sec stun. Set up Regen if you like, weave in Asylum and commence the Holy spam, using Tetra/Bene as needed.
-If you need to GcD heal Solace>Cure II. Don't use Cure I unless you're absolutely dead on mana.
-Treat Benediction as a strong oGcd heal rather than a rare emergency button. It's a useful tool to save GCD's.