Interesting, mine is essentially acting like yours.
Since the TSB, once it has warmed up a little bit, she'll will shudder some in first gear. I'm @ 23,400 miles, so with a fair bit remaining on the powertrain warranty, I've been biding my time ... waiting / wondering if it will get worse. I'll go to the dealer again when it warrants it, but my sense is that they'll tell me the tranny is fine.
I've got to run some errand this morning, I'll wait 'till she starts to shudder and try your fix.
Gold Nugget: '12, 400A, Wintr Pckg, Yellow Blaze HB
Mods: Llumar Tint:35 / 20; K&N fltr + Snrkl Del.; Splashgrds; Grill Pinstripes
Hatch Nation #174