SVX sorry to pick up on this again so long after your pix. Nice bike. Didn't realise you had that front end conversion, so comments about rise have to be put in context
Profile largely determines 'side grip'. As a general guideline, as you know, more sporty road tyres have a steeper profile, where sports tourer tyres are closer to a U. The OE size of tyre is determined by front end geometry, the fact that no current sportsbike uses a 120/60 doesn't mean to say that the 120/60 isn't fairly well suited to the SV. The fact that you're using clip ons means that the rise wont affect straightline stability in the same way it would if you were using higher, wider bars.
Guess I'm just pointing out that very few things in biking offer unconditional benefits with no down side. The other thing for me is that I'm trying to have as much fun as possible for minimal outlay, so major front end conversionas are a non starter. BTW whereabouts are you?