Let's talk about Savage Coil. There are 2 big problems with it. Its too late for any changes for 2nd coil but with the Final coil coming out I hope Savage coil can have some changes this time around.
1. Incentive to run savage coil.
Our free company coil group beats the second coil of Bahamut turn 6-9 in about 1 hour each week, then we are done with end game for the week. Some people in the FC leveled alts to run coil again. Now then some people in the FC do not care about even trying savage coil because it drops the same gear as normal coil. They don't care about titles or achievements, all that really matters for the majority of the playerbase is the gear. It only takes a couple people in your FC coil group not willing to try it and makes the whole group not be able to attempt it. Ask any person who has beat T9 why they don't do savage coil its almost always because they don't want to do it because there isn't a big enough reward to do it. Personally I would do it for the titles and challenge but everyone is not like me they need that better gear motivation to do it.
Solution: I would make savage coil drop slightly higher ilvl gear, half a tier higher so 10 item levels. Also add in the bonus of having the gear look different then regular coil gear, do a recolor or make it dyeable. This would give every FC who already has normal coil on farm the motivation to step into savage coil and try it out.
2. Shared lockouts.
Having the Normal and Savage coil share lookouts doesn't work out so well. No other content in FFXIV shares lockouts for different difficulty levels. This way if some people in your FC coil group do not want to run savage coil can easily make another group with different people that are all interested. Getting locked out because you did normal mode just doesn't seem right.
Solution: Separate normal and savage coil lockouts. This will let you do both and if different groups if need be.