Board Thread:Suggestions/@comment-24278356-20150405133400/@comment-2149672-20150408185748

They could still stack via the regular method of " x1.25x1.25 = x1.5625.", but that signature is the only place that specific stat could be increased/modified.

They may be slow, but they are still a..."retreating" option. It's a way to slowly chip away at HP while still retaining some form of stamina advantage.

This may sound stupid, but I don't think nerfing sigs/ultimates is the way to power them down. Instead make tweaks on how they are formed, and global limitations to cut down their priority.