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[EaMett]

Well there's a lot to this topic.
The tldr is that every healer has a security padding to make up for their or other people's mistakes. The amount of padding is what separates the good healers from the bad. Too much padding: you're just a healbot and aren't contributing properly. Too little: people die and you aren't contributing properly.
Keeping in mind that you can't heal stupid, you have to find a good level. If 100% padding is keeping everyone topped off, and 0% someone dying (not a ridiculously stupid death) then 20% or so would be a sweet spot. How comfortable others are regarding this padding is pretty irrelevant.

In my case the main point was(is?) that there was no real danger, no wipe 2 seconds away.
I'm very aware of the boss damage output and skills. If someone has 10k+ hp and the electromagnetic field is ~8k damage (and as far as I've ever noticed doesn't crit) they aren't going to die. If you add to that the fact that there is no damage output for party members for a good 5-6 gcds, there's no lag spike that's going to do you in. (and if there is you're probably already lagging badly and would know better).
Furthermore, that following electromagnetic field is followed by the target search that only the mch failed early on (and if you payed attention they made it out unscathed even though they painted each other into a corner at one point), so there was no urgency, they could handle themselves. You'll notice I still pull their health up enough that they could fail the target search and still survive.

That's basically all you need to do, make sure people have enough hp that they can fail the next (set of) mechanic(s) without dying and your padding is adequate. Can someone still die if they get hit and stand in the ground dot... Sure, but that's seriously stepping into stupid and I was saving swiftcast in case.

It's a pug and it can't be helped that people don't know what you're planning and often times don't know the fights and pulls as well as you do. That doesn't mean you should lag behind and keep everyone topped off because their "comfort" expectations aren't met otherwise.
My story of the PLD or RDMs healing when barely bellow 50% should strike you as being way over the top, not something aggravating.

Also, on a side note and because this is relevant. You'll soon find that people who are topped off just don't give 3 flying ducks about mechanics. Someone at 40-60% pays way more attention, and someone at 30% or bellow suddenly becomes a pro gamer. Save yourself some pain.