I recently replaced a pair of Cane Creek SCR-5 levers with new 9-speed Shimano Sora STI shifters. After the swap, it feels like there is no modulation, especially on the rear.

With the old levers, I could scrub a little speed with just a touch of the lever and never had to worry about locking up the rear wheel. Now I have to really squeeze the lever to scrub and if I go just a tad further, the wheel locks up. There's no middle ground, it's weird.

Calipers are 105 BR-5501 and cables/housing are brand new.

So I'm wondering if Shimano changed the cable pull with this group? Maybe I just need to get used to the new ergonomics?