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232 is a self shielding wire therfore doesn't require shielding gas. There wasn't any mention by the OP whether the WPS was Qualified or Prequalified...........But, as Wayne stated though, for a prequalified B-U2a-GF with a 30* included angle and 3/16" root (taking the fitup tolerances of plus1/4", minus1/16"); you could use the 1/8" root but would have to switch to a wire that has a shielding gas(according to the notes) in the prequalified details.
..to stay with the 232 and to remain prequalified I would suggest using a 45* included angle, and the 1/4" root or a 30* included angle and a 3/8" root, where it states that a shielding gas is "not required".
I hope all of this isn't too confusing...if you look at the prequalified full penetration details in Section 3 of D1.1 while reading all of this...it will make more sense...LOL