About the lumbar support. Mine it just broke and it was repaired(the whole back mechanism, it was replaced - $945 !) by the dealer.
I have got a GT as a loner for the weekend. I have noticed, that the lumbar support is more pronounced in my 14' Touring, then on the new GT(not sure, which one it was though, 2016 or 2016.5/no LED headlight).
Most likely, the easiest and cheapest, is to just add some extra padding.
I have lower back issues, so it's important for me, to have a good lumbar support.