Eeee... I remember differently. FlexSteels aren't midscooped and more flexible than Pro Steels within the same gauge.
It could well be the case, it's been a while since I had the Flex Steels on my bass. The closest to them I've tried since are the Pro Steels. Probably less flexible but still quite flexible imho - more flexible than most, I'd say - and also kinda scooped, methinks.