OP, you REALLY don't want to be messing with the Hybrid's stock tune.
The two mode has very complex programming that's specific to the way electric, hybrid, gasoline, and AFM operate and interact with each other ... if memory serves me right BBP won't go near it.
Plus I'm not really sure what it would achieve ... the stock tune is already optimized for fuel efficience, the transmission is the smoothest shifting of any NNBS transmission. You might be able to get a small amount of performance out of it but that'll be at the expense of fuel efficiency, which presumably is the priimary reason someone would get a Hybrid version of these trucks.