Not sure, but maybe levers with metal bodies instead of plastic which became quite common in the late 70's and into the 80's, might have a more positive, solid feel to them..... I'm saying that because I had noticed more flex on my plastic bodied levers like my CLB aero levers, than what I feel with my Weinmann Carreras, which has a cast aluminum lever body.
Also, be sure to adjust your cables to have the least amount of slack as possible to get the most positive feel from your levers. It' similar to bleeding air out if your car's braking system. That, combined with proper brake cable routing on your handlebar and frame will maximize braking performance..... beyond that, you might have to go to a more modern brakeset to do better.
Last edited by Chombi1; 11-30-18 at 08:22 AM.