To be honest is sounds more like either it's running lean or as Sid says the carbs are out of balance. Doubt very much a new battery will make any difference. If you roll off the throttle does it go a bit faster? If you roll off then on again is it better than if you'd just whacked it open and kept it there?
On the two curvy SVs I've checked, the throttle position sensor was a mile out of adjustment, not sure how big a difference it could make as when set back to rights neither bike seemed different. Also bin the retarder (TRE mod), no need for this really but might help.
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