A few things about the "center of gravity" issues raised:
While it may feel as if you are up an inch and a half higher, it isn't really that much unless you specifically ask them to boost you up At least not as compared to stock 1st gen seats. It's about 3/4 to 1" higher at most. But it does feel quite different. Also, whatever the raise to your butt level actually is, it will lessen somewhat, in time, as the seat breaks in.
Raising your hips up by an inch does not mean that your body's COG will be that much higher. The raise in seat height is mitigated by lowering your torso angle, which automatically happens as you reach for the now lower bars.(unless you also put on risers). Only a fraction of your total body weight will be raised, therefore your body's COG will be only that fraction of an inch higher. Then the ratio of your body weight to the bikes weight needs to be applied.
And when cornering in "sport mode" just getting your head and shoulders down and behind the inside mirror will bring that weight where it needs to be. Any minor changes in COG is hugely offset by elimination of the swelling, redness and overall pain in your butt achieved by riding on a Russell. JMHBO