Oh damn! You use the Tow/Haul with the TransGo setup you have?

Well, why not just get you a new seperator plate?

Enlarge all the holes BUT the 1-2 clutch feed and make the 2-3 a bit larger only. Sounds like that'd be right for your needs. It'll tone down that 1-2 shift a ton...

With the TG setup you really don't need to use the Tow/Haul mode either. It really only bumps line pressure and raises shift points. You can always manually shift the truck yourself...