I tested as SCOEN and I read the paragraph descriptions online, and even though inquisitive seems a tiny bit more like me, the SCOEI description ("not afraid of doing the wrong thing... aggressive, fearless, controlling, domineering..." etc) put me off and didn't sound as much like me.
Well, none of that is really related to inquisitiveness, it's more like the mixture of Organization and Egocentrism. it's probably best to read all five SLOAN category snapshots separately.
SLOAN isn't too hard anyway, it's about very basic personality descriptions. Hell, the words are keys -- it's pretty easy to tell if you're sociable or reserved, emotionally stable (C) or unstable (L), organized (O) or messy and scattered (U), selfless (A) or selfish (E), and curious (I) or non-curious (N).
I tested surprisingly high on 1 & 7 on an excel sheet enneagram quiz I did. I know that 4 integrates towards 1 (and 1 is the soul child of the 4) and 5 disintegrates towards 7, so maybe that is why....
"Charlotte sometimes dreams a wall around herself. But it's always with love - So much love it looks like everything else. Charlotte Sometimes - So far away, glass sealed and pretty." - The Cure
I think trifix is independent of wing (as I haven't seen any literature that says it's not). My theory here is that the wing is decided on basis of how it blends into the core type, so if you're undecided between two trifix types that share a wing, you should figure out which wing complements each type more (I for example was stuck between 3w2-5w4 and 3w4-5w6).