I was going to suggest Shimano CX70 cantis, then I remembered the bike I fitted some to has issues due to the downtube-routed gear cables having their stops on the headtube, so the outers interfere with the front brake cable when steering.
I have Tektro 720 cantis currently.
Cables run along the tt so shouldn't be an issue but are different canti's going to be a decent step-up?
Mini v will feel a little less direct, but a lots more power.
@miro_o started
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I was going to suggest Shimano CX70 cantis, then I remembered the bike I fitted some to has issues due to the downtube-routed gear cables having their stops on the headtube, so the outers interfere with the front brake cable when steering.