I almost bought one of the cheap SDGT, but I did not like it much on the test ride, it vibed a lot more than my 1190 - probably not helped by tall top gear, then the suspension felt rock solid after a decade on adventure bikes, the killer was I did not fit on it, it bent my back in half and my legs did not fit into the sculpted bit where they are meant to go.
Even the lower gearing on my 1190 still requires at least 60mph before top gear feels smooth, but that is what gears are for!
The only real tweak I made to the adventures I have owned is moving the gear shift lever as standard you have to lift you knee to your ear before the top of your boot even touches the gear lever to change up.
To solve the pillion problem get your Mrs on her own bike, worked wonders for us, much more comfortable, we can go much further in a day with less aches and pains at the end of it.
A long trip is the best way to get a feel for a new bike (That's my excuse anyway)
might just be me getting more used to it, but I would swear my gt is getting smoother with the miles ??
totally agree , a long trip is the best way to get to know a bike,,, that's sometimes why a half hour test ride can be somewhat unhelpfull ,especially on a bike that is a departure from what your used to,