If the OP thinks regular Coil is hard, I'd suggest they not even touch SCoB Savage.
In all seriousness though: people in this game need to stop asking for nerfs.
Ozma? People wanting Edda's fight nerfed (lol seriously)? I'm sure there were plenty of "Please nerf [content] in Dun Scaith" threads when it first came out (though I was on break and not checking the forums regularly at that time). And now Coil?
OP, no one queues for Coil these days because 1. It's old content (just like people rarely directly queue for ARR Ex primals unless they are new players and actually level 50), and 2. Because people know they can just toss up a PF and run it unsynced. Perhaps even 3. Don't even know about its existence (I didn't know anything about Coil or even Crystal Tower when I started playing).
I think this game needs more challenging content, which is what Coil was back in its Prime (wish I had started playing back in 2.x to experience it as such, but didn't have extra money to spare for a sub between bills and other things that required adulting). I'm tired of how easy things are nowadays. And I know we have to cater to the more "casual" playerbase, but does that really mean making things so easy that I could do them with my eyes closed? It shouldn't.
People still run Coil today (albeit unsynced) for Wonderous Tails, or for glamour (for a long time, the High Allagan Body Aetherstones and Neo-aetherstones ran for 500k or more on my server; sometimes the High Allagan ones can still fetch a pretty penny, and some of the faded Orchestrion copies sell for a lot too). Some people run it with newbies for the sweet Poetics bonus (minus T3). And some people use it for tank mounts/achievements (T4 can easily be duo'd by two confident/competent tanks; perhaps even solo'd by a WAR). Sometimes I go in with a friend to see how far we can make it just us two (we cleared T13 with WAR/AST/BRD before, and really want to clear T13 just WAR/AST or WAR/SCH, and we cleared T5 with DRK/SCH; we actually went in wanting to make it to enrage and just heal through it--that was actually really fun).
If you want to run sync'd Coil, toss up a PF. Make it minimum ilvl for even more fun. I saw a sync'd T9 run in PF a few weeks ago, and would have joined if they'd had a DPS spot open (I'd rather clear it on BRD since I know that job the best out of all my 60s). But if you think it's hard unsynced at 60, it will be even harder sync'd down to 50. Which is a good thing. It's supposed to be hard. A lot of the "insta-death" mechanics are still in current/Heavensward Ex primals (like Wall Sempai, except they nerfed him too where he only ticks for 9,999 damage instead of instantly killing you). You're working your way through the Coil series to fight Bahamut (or a representation of him). Bahamut, who obliterated parts of Hydaelyn, and permantently changed other parts. Why would anyone want something that epic to be faceroll easy?
Just follow mechanics. It's really not that hard to do. Makes fights a little easier if you understand how to do the mechanics, and some of the Coil ones can be cheesed, yet still followed (Twintania's divebombs, the last phase of T9 is basically zerg'd through now, and if you have a semi-decent healer the tank can just eat Bahamut's Ahk Morns solo).
Leave Coil as it is. There's no reason to nerf it more than they have (you get like 20% or 30% echo instantly now, I mean come on). There's no reason to change anything about it, and the developers aren't going to spend time reworking and nerfing 2.x content when they need to work on developing good 4.x content.