I'm a level 55 Astrologian now, and I just did my first Heavensward dungeon (The Dusk Vigil)

I just have a few questions.

1) Should I now be using Benefic 2 over Benefic now? It seems like Benefic doesn't do enough healing anymore.

2) Seals. Should I always aim for a Lunar, Solar and Celestial seal, or are different seals OK too? I've been trying to aim for all three, but sometimes it feels impossible.

3) Cards. I got Lord of Crowns and Lady of Crowns. Should I proc these after I get my seals and during Divination cooldown?

4) Diurnal / Nocturnal Sects. Which of these should I be using? I've been sing Diurnal almost exclusively.

So far, I REALLY love Astrologian, and I'm very glad I chose it. I love the card aspect, and the Diurnal and Nocturnal buffs.