I'm not a numbers guy for the most part, but I find that Illusion's attack chain really works best with one of the other APP sets with a Blast. On my Ill/Rad and Ill/TA, I use Blind-SW-Fire Blast-SW. On my Ill/Storm, I use Ice Blast in place of Fire Blast. I have used the Primal Blast, too, and presume that Psi's Mental Blast works well.
The Blast also lets you stay at range, which is generally safer. You also don't have the problem of Phantasm knocking back your target. Once I get the APP blasts, I see no need to bring my Illusion controller into melee range. Of course, that would be different for an Ill/Kin, but mine isn't up to APP levels yet.
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Guide Links: Earth/Rad Guide, Illusion/Rad Guide, Electric Control
My troller has soft capped Defense for S/L, and 30%+ on all other forms of defense and +500 hp (and healing) from perma-EE, so I have nothing to fear in melee (generally can wade through x8 mobs of +4's without too much issue).
I'll take Seismic Smash over any other troller attack anyday. I'm not trading out Stone it's just not gonna happen 
CoH
Cathodian (50 Rad/Rad)
Archanix (50 Ill/FF)
Dr. Deadface (Current: 40 Rad/MM)
Hey guys, I was hoping someone good at the numbers could help me maximize my controller's single target attack chain. Currently, I can solo AV's but it's slow going and I'm hoping to work on that.
Illusion is the primary, FF is secondary, Stone is the Mastery, so my current attack chain consists of the following powers:
Spectral Wounds
Blind
Hurl
Seismic Smash
Boxing
All powers are currently 6 slotted except Boxing (1 slot). Complicating the situation, I would prefer at this point to trade in Hurl for Fissure for the AoE and additional soft control. My gut tells me Hurl's slow attack cramps its dps, and that with good Proc slotting on Boxing I may be able to pull off an equivalent dps-wise attack chain without it.
I am perma-hasten (assume consistent 276% recharge), which helps get Seismic Smash in the mix as much as possible. Damage-wise, I run Assault for an additional boost. Obviously I get no bonus damage or -res from my secondary.
Thanks in advance!
CoH
Cathodian (50 Rad/Rad)
Archanix (50 Ill/FF)
Dr. Deadface (Current: 40 Rad/MM)