Something stupid-High RPM Misfire/lean condition

[PSIValentine]

Last night my sr swapped s13 started to, what felt like a misfire, like it was leaning out or something. I popped the hood and realized that the vaccume hose from my boost controller to the charge pipe had oil on it, and had swelled up and slipped off. I immediately replaced the vaccume hose, and it improved but it's still doing it. I pulled the plugs, which were almost brand new, and they look like it's running really lean, which scared me. It's runs fine, but if i accel WOT high RPM or even just max boost, it starts spitting really bad, like BTTTTTTtttt, sounds like a machine gun, my friend thought it was my spare tire. Either way, lean conditions scare me.I bought it with the motor swapped and FC commander (which i'm not completely firmiliar with) Almost 4 years ago, and since then i swapped the Turbo and an array of other things. I know i'll figure it out but if anybody has any experience with this, or any exstensive knowledge with the FC commander let me know. I have a few questions about things i can't figure out.

I'm hoping it's still just a vaccume leak, as the hose i put on didn't fit super ninja snug on the petcock, but either way, any ideas before i start trying to figure this out?

Thanks.