Did you try adjusting the idle speed to 1300rpm when warm? Is so, try turning the throttle between full on and full off a few times with the engine not running. If that helps for a little while, replace the TPS.

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Pat- 2007 DL650A was ridden to all 48 contiguous states. 2012 DL650A is just getting started.
Nicknames for posting ease on my part, Vee = all DL1000s. Wee = 2004-2011 DL650s. Glee = 2012+ DL650s