The key is to not wipe if you don't want the echo buff. :3 (I didn't know you could turn it off at all.) I'm expecting PF groups to start saying "NO WIPES" in the description. XD

Here is the Coil echo buff excerpt for how it will roll out over the next couple months:
■The Binding Coil of Bahamut

○ Adjustments made in patch 2.2
　　- After the patch 2.2 release
　　　・You will be able to enter the dungeon through the Duty Finder (full party only).
　　　・The weekly entry restriction has been removed.
　　　・The effect of ADS' “High Voltage” has been alleviated (Turn 1 and Turn 2). In addition, you will be able to remove the paralysis effect via Esuna, etc.
　　　・An item level restriction will be implemented in every turn of the Binding Coil of Bahamut.

　　- 2 weeks after the patch 2.2 release
　　　・You will be able to enter the dungeon through the Duty Finder (solo).
　　　・The reflection damage of the Clockwork Knights in Turn 4 will be alleviated.

○Details
　　- After the patch 2.2 release
　　　・None.

　　- 2 weeks after the patch 2.2 release
　　　・The effect will automatically be activated upon entry of the instance.
　　　・Your HP, damage dealt, and cure potency will be increased by 10%.

　　- 4 weeks after the patch 2.2 release
　　　・The effect will automatically be activated upon entry of the instance.
　　　・Your HP, damage dealt, and cure potency will be increased by 15%.

　　- 6 weeks after the patch 2.2 release
　　　・The effect will automatically be activated upon entry of the instance.
　　　・Your HP, damage dealt, and cure potency will be increased by 20%.

　　- 8 weeks after the patch 2.2 release
　　　・The effect will automatically be activated upon entry of the instance.
　　　・Your HP, damage dealt, and cure potency will be increased by 30%.

　　- Beyond 8 weeks
　　　・While we’ll monitor the situation at that time, we believe 30% should be okay as the maximum amount.