I had +40% Damage on my Inv/SS Tank for awhile, so +120% with Rage. 15% of that came from Assault, and 10% from the Assault Hybrid, so it was pretty easy. I could have probably added another 20% if I really built for it (by breaking up the Might of the Tanker ATOs, for example.) It's fun and definitely noticeable, but eventually I dropped Assault and settled at a passive +20% Damage (for a nice even 100% with Rage.)