What build would be fun with a 400+ pdps dagger?

I bought a 402 phys dps dagger (Sai) for very cheap and leveled an ES Assassin Blade Flurry with chaos emphasis to lvl 93. It was/is okay. But really not that enthralling. Clearing trash is not so much fun but it takes down bosses fairly well... that is, except for guardians. For some reason, I have a hard time killing guardians with this build. I don't know what it is. My howa build or my Brutus build takes them down WAY faster. But regardless, I'm guessing that a different build might utilize this beautiful dagger in all its glory.

So here's what I think went wrong.

1. Should have made a Raider blade flurry with 8 frenzy charges. Since the Sai doesn't have crit bonuses (instead it has block intrinsic), I should have concentrated on maximizing physical damage thru frenzy charges instead of the usual Shadow/Crit route.

or

2. I should find a way to convert the phys damage to elemental and scale the elemental. i.e. I am currently building a frost blades raider for this purpose. Using frost blades and taking Weapon Cold Damage/Winter Spirit on the passive tree gives me 100% conversion to cold.

or

3. I need to think out-of-the-box and come up with a wacky different build. Like dagger cyclone or something.

What do you think? Do you have a suggestion for me? I really would appreciate any input. Thank you all.

Chaos may have been underwhelming against some of the Guardians because some of them are Immune to Poison.

Fun varies from person to person. If I had a 402 pdps dagger I would probably build a Flicker Strike Raider.

Flicker Strike. Interesting. I think I'll give this a go. Thanks.