Losing those sets definitely has an impact, but not enough impact to match Wisconsin losing to OSU. Pitt has compensated for a weak schedule by dominating everyone they play. I don't think they'd be at #2 if they were beating mediocre ACC teams 3-1 or 3-2. Hats off to GT for giving them a solid challenge, but I don't think the Clemson game should've been nearly so close. Clemson is not good.
The biggest games left are:
Texas at Baylor
Wisconsin at Minnesota, vs Nebraska, at PSU
Nebraska at Minnesota
Stanford at Utah (Pitt beat Utah)
For RPI purposes, we want Cincy to stay in the top-25 and OSU to stay in the top-50. Cal Poly and South Carolina have actually done pretty well lately too. It would be a huge snub to be ranked #2, in the RPI top-4 and not get a top-4 overall seed.