Abbadon and nova mortis have bugged stability. They are the same gun as thunderlord but with different elements, yet their actual observable stability in game is terrible. Thunderlord's stability is noticeably better.
Video proof : [url=http://pic.twitter.com/I6jV8FOB4x]Recoil comparison test between thunderlord and nova mortis[/url]
This used to be a problem for the thunderlord too, but it got fixed on thunderlord in the update on 06/14/2016 : https://www.bungie.net/en/News/Article/44846/7_Destiny-Update---6142016
[quote]* Fixed an issue where Exotic machinegun stability was ignoring the base stats for recoil (Thunderlord, Super Good Advice)[/quote]
This same issue is obviously affecting the abbadon and nova mortis...
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thats because they made them with ttk. they copy pasted the thunderlord in its ttk state when it had terrible stability. during late ttk (or april update?) they fixed the thunderlords stability, however they forgot about those 2. classic bungie.