Not a problem!I don't mind helping out!
In regards to Bene - I don't know if you play on PC or PS - if you play on PC then this might help a little: If you're still struggling to keep up HP or you can just intuitively tell that your next cure II will probably take too long to cast, hover your cursor over Bene - So you're still able to spam Cure/II readily but have Bene "queued up" with a click of the button. A little harder to do if the problem is keeping more than one target alive and not focused on just one person, but it sometimes helps.
For Example situation: Titan EX - Everyone's health is low from derping and then stomps start while I'm in the middle of Medica-ing. I notice the MT's health is about 50%, so I select the MT while medica casting, then hover the cursor over Bene, just in case. Fear warranted, they're mountain bustered to about 20% HP at about the end of my cast - once medica goes off, I click that Bene immediately.
Otherwise, Bene being too slow is just something we all deal with z_z
As for the rest - healing can be very situational. The tactic you use can be determined via observation of the tank's defense habit and the DPS' output (...and ability to actually get out of AoEs).
When holying things - I really think it depends on the situation and the team makeup. I personally don't add Medica II on top of Regen since Medica II's ticks last far longer than Regen's. It has a higher chance of still ticking away by the time the mob is dead and we all know tanks are just going to running off, regardless it's still on them.I have heard of people using it for that, but personally don't. Regen tends to fall off roughly at the time of the last mob's death, for most of my runs. I also wouldn't suggest using Medica II if you have a BLM thats AoEing/Flaring. Things tend to die pretty fast. A divine seal + top off cure + Regen is usually enough to sustain the tank a few holys in mobs. The first two-three holys will stun the mobs anyway, so healing shouldn't be too necessary for at least the first two. The Regen ticks should help gain back what HP was taken during your first holy.
If you have like, two melees that don't seem to be very strong in their DPS and mobs are taking a while, on top of people getting hit often, it could be an option. I just prefer not to with exception to raids where the possibility of derp is high.
If you're still insecure about the time holying and the amount of HP taken away during that cast, you can use Presence of Mind to speed up your casts.
I tend to stance dance when I'm being Holy-aggressive. Holy three times, slap Cleric off, Cure II, Slap Cleric back on, Holy two or three times, Slap Cleric off, etc. pretty much the same way as I described "queuing" Bene - I tend to have my cursor hovering Cleric when I'm Holying. Again it's situational and just paying attention to how hard the tank is being hit and forming a rhythm based on their HP loss.
With Presence of Mind, you'll get about two (or three?) Holys in before Cleric comes off CD. I've become a bit robotic about that combination, at this point.
I tend to Swiftcast + Holy for emergencies ---- for the stunning. If I feel like the party is being overwhelmed, my healing is overwhelmed and I just had to Bene the tank with plenty of mob still hanging about, I'll SC a Holy right after the Bene if the mobs haven't stun resisted (for ex, if we're fighting a mob, and we're badly positioned to suddenly accumulate more mob thats roaming).
Also works if you see mobs (or in raids, spawned trash mob... I can not honestly say I've seen many OTs go after the trash mobs that are going straight for the healers.) going straight for you and no one is picking them off. I'll also do this if I see a squishy in another alliance getting slapped by trash mob. Other healers will often help out the squishy (or help themselves) while they're being slapped, so I'll take the initiative to stun the monster(s) so theres more time for DPS/OT to get to it, the person can run away/catch up on heals or casters tear it apart/slow it (and quite honestly, I rarely see tanks pick up anything I drag to them, so I've stopped bothering in raids >_> but probably because it's hard to tell in the mess of things). It's just buying a short bit of time to survive.
SC + Holy can be a very nice self defense mechanism.