Grades look pretty good from my perspective. Maybe you tweak the lineup to B+. The hitting itself deserves an A to A-, but you have to consider baserunning as part of the lineup grading. Someone will give me the correct ranking, but I believe that the Twins are at or near the bottom in baserunning. They are still a bit reckless on the basepaths and that will drag down the lineup grade.
As for RISP, it's logical to think there will eventually be some regression. I would like to point out that the Twins have improved in reducing strikeouts over the course of the season. Just making contact should improve your RISP numbers. I just watched a video where someone was analyzing the Rays and their inability to hit home runs this year. What they do very well is put the ball in play and run. Constantly putting pressure on a defense (as we have seen first-hand) definitely helps out a team.
I don't think that a team can be clutch, but certain individuals certainly can be. Clemens and Bell are currently the best on the team. They are willing to sacrifice power in order to drive in the run. We have seen that over the years from some of the best like Miguel Cabrera, Wade Boggs, Joe Mauer, Paul Konerko, and Jim Thome. I still remember Bert Blyleven describing Cabrera as always being able to "smell" that RBI. I know modern analytics don't think the RBI is a real stat, but your approach on how you get that RBI certainly makes a difference.