One other thing that just occurred to me... I think you're being hasty in judging the Bandit too heavy. You have a mere 1200 km of experience. I've ridden that in a day! You need to work on your skills and then the bike will no longer feel heavy.
I just think there isn't a bike in existence that will give you what you want. You can't have the power of a 600-four, the easy control of a standard, and the weight of a sportbike. It doesn't exist. If I had to pick a bike for you, it would be the
Ninja 650, though I'm not sure you'd appreciate the compromise between weight and power.
Bottom line, you have to learn to deal with a whatever bike you choose, and you might find yourself disappointed. See if you can get a demo on a GSXR just to see for yourself what clipons are like. If you're fine with them, you may be fine with the bike. Just remember the great advice Kay offered.