Sorry but isn't Chaos the line that increases your boon duration, not Inspiration which increase Healing power?
I've moved away from GS/Staff build for a while now, but while I was using it roaming PVE, I ran a 20/20/25/0/5 build. Now I think of it, it wasn't the best and some things can be tweaked better. Probably a 20/20/10/15/5. Something like this:
I agree with the above two that Chaos might not be the best line to get, but I find it helpful for map-running, especially Descent into Madness (you can tell I do a lot of climbing to avoid mobs right? XD). I use that when running around and use Debilitating Dissipation while fighting. Dueling line is useful as well, that deceptive evasion is priceless, and you might combine that with Crippling Dissipation if you're just running the map and don't want to fight every single mob.
This is strictly phantasm build btw. Ideally I'd use F4 for life-saving but in reality I hardly use any shattering at all. If you're running in a condition-heavy map you can change null field to mantra of resolve. Btw, the extra bounce only applies to your own attacks, I think you already know that. ^^"