If I was in your situation, i'd probably get a lightened crank pulley, maybe +1% in size too. Or if you want a really cheap handling
mod, get yourself an OMP lower strut brace.
That's what i'd do, i'm sure other more experienced tuners will have some better suggestions. I think what you have been told is right though, the TB doesn't become a restriction on an
MCS until you have made a lot of other mods.
Good luck with it anyway.