Racing roadkill
Guru
The 105 callipers will give you about a 40 percent increase in braking effect over the stock callipers.I was the opposite. I had a 2010 allez elite with 9 speed tiagra. I was never happy with the brakes, changed the pads, fiddled with the set-up, still didn't like them. Then I bought 105 calipers and what a difference they made. I never looked back. It was a while ago, but they weren't bank-breaking, about £45 for the pair if I remember correctly.