Call me old fashioned but I can't go on my hols leaving people in suspense.
If the car felt like the dyno looks then the OP would be far from happy, when he seems ecstatic with his remap.
IMHO They've not set the dyno up correctly for a GTD hence the massive "squiggle" that clearly shouldn't be there on the end of the stock map run, this is also evident when the OP stated that the mapping company struggled with the traction control on his GTD which is never a problem on the golfs I've mapped.
The "twin peaks" are simply not there on either a standard or correctly modded GTD so I'm assuming the cars also either not strapped properly or it's further problems brought on by not setting the dyno correctly for the GTD.
I have no idea why they allowed a stock run that looked like that to go out on a graph.
(I'd still like to drive it though to make sure - anybody up for a 2p bet?
)