A v specific lever has more "pull" than u/caliper levers.A brakes are a pain in the arse to set up.Do you have the instruction sheet with them?
Once you`ve fitted it,leave the springs pointing out-not secured by the retaining pin then tighten down the bolts before popping the springs back behind the retaining pin once you`ve got enough tension to keep the blocks from rubbing on the rim once the lever is released.