..Where you can attack during the cooldown time, the aftercast time?
If so, agi won't help you at all.. actually (if you don't have any -aftercast gear), you've probably wasted your stats unless you can reset.
The only way I see this build work is with poem..
As for the gear, it's okay, but you should really switch a cranial shield around, and a quad mummy / quad howard for high flee chars.
Let's also not forget quad marina + wind weapon or wind convs.
I'd really replace that pecopeco card for an evil druid / marc, and replace that wild rose for green ferus, if you can get one.
There is no 'build' that allows you to attack during the 'cooldown' time, for sbk it's just too high and the only ways are -aftercast cards/gear (like kiel-d, expert rings) or poem. So in the end it comes down to having amazing gear or support all the time.
IMO, there are only like 2 effective sbk builds, those are 9x INT, 7x-8x-9x VIT, rest in DEX and hybrid 8x STR 9x INT rest in DEX.
AGI just doesn't cut it for SBK..., not without support.
You have to remember that solo SBK is all about getting a status off, sbking and then getting away just to chip a measly 4-5k again, nothing more nothing less.