Like I said I'm not a Dark Knight (Final Fantasy XIV) expert, you're not a Paladin and don't have as many CDs to cycle, so you'll want to take more advantage of breaks in damage, such as a FF14 White Mage(WHM) using Holy which stuns the mobs, etc.
Final Fantasy XIV: Defensive cooldown help
I'm not going to try and tell you the best use since I'm no Dark Knight(DRK) expert, but when tanking if you want to get the most out of your buffs, one of the most important factors is the CD times of each of your skills. For example, if you're saving a buff with a 90s CD so that you'll have it in >3 minutes, you just halved the amount of time it could have been mitigating damage for you.
Now taking CD times into consideration, simply cycling them from shortest CD time to longest (saving big buffs as needed) you'll be able to maximize the amount of time you spend buffed. As for Foresight, it's not great, but as your healer I'd be more appreciative of consistent buffing, rather than bursts of heavier buffing when it comes to trash because trash is consistent repetitive damage, and so you can make yourself more consistently manageable. Worry less about buffing as mobs start dying off and instead you can focus on reserving them for later, because your incoming damage has now decreased and you're less difficult to keep alive.
Like I said I'm not a Dark Knight (Final Fantasy XIV) expert, you're not a Paladin and don't have as many CDs to cycle, so you'll want to take more advantage of breaks in damage, such as a FF14 White Mage(WHM) using Holy which stuns the mobs, etc. if you're able. And you may want to allow for breaks in between your buffs just to allow for more time spent on skills cooling down.
As for the healers part in this; that feeling of your HP rising and plummeting sometimes and not others is probably because your healer isn't utilizing their shields or Regens. On trash an FFXIV Astrologian is best off being in Diurnal stance, which allows him to keep up a regen on you, stabilizing your hp a bit and making up the difference with small or large heals as needed, and FFXIV White Mage does the same thing. In order for the White Mage becomes strong,you can buy ffxiv gil.Scholar is a little more complicated and it has a variety of options, but it has a couple shields meaning you take less damage, and also has Eos and themselves healing you in rotation which can feel similar to a regen. There's also the odd thing like the ability to AoE stun--and then some healers DPS and others don't. And lastly if other things are going on, like DPS are taking damage, that takes away from a healer healing you.
Maximizing up-time is important on trash, but on trials and raids it's important to prioritize managing burst damage first and then you can think about popping buffs in between to make the overall experience smoother. Hopefully an experienced Dark Knight (Final Fantasy XIV) will be able to post here with more specifics on how to mitigate AS a Dark Knight, but ultimately the key is understanding healer strain (where the damage is coming from, how much and how consistent)
I never had MP issues as FFXIV Astrologian in both Nocturnal and Diurnal
I never had MP issues as FFXIV Astrologian in both Nocturnal and Diurnal. Knowing the exact phases helps a lot when it comes to cooldowns.
Final Fantasy XIV Leveling 48 Astrologian and need a bit of advice
As a disclaimer, I am only a level 48 Astrologian, and I do not have end-game healing experience, so I cannot say exactly how to prioritize everything.
That mantra still applies to FFXIV
That mantra still applies to FFXIV. It's the internet. Just expect more of the latter. It stinks, yeah, but people take advantage of anonymity. And their insecurities show a lot when they're stressed
My suggestions for FFXIV Astrologian are mostly as written on the shortlist in sig
Draw will only cool down for up to 15 seconds before the card already drawn must be used to continue the cooldown. At level 40, FFXIV Astrologian receives the ability Spread, with no cooldown, into which a drawn card can be saved.
When did you start tanking in Final Fantasy XIV?
The learning curve and challenge really held my interest in FFXIV, my first mmorpg, as I read guide after guide and asked endless questions on FFXIV Realm.
Final Fantasy XIV A Realm Reborn Bard vs Dragoon
As far as PvP goes, Bard is kind of the Sniper class of FFXIV. You don't move anywhere close to the front lines of a skirmish. Because of WM and the skills gated behind it