There are several reasons which could be the cause of your troubles. Glazed pads, poor mechanical advantage, too hard a pad compound, air in the system are the things that come to mind, and I've listed those in the order of easiness to fix. Only try one of these things at a time, otherwise you'll have no idea what fixed it (or made it worse!).
You can whip out the pads and try scuffing them lightly (I use a belt sander) to remove the glaze that builds up on them. If there's a really large gap between pad and disc, brakes can be shimmed so that that there's not as much travel on the pedal before the initial 'bite' (unless the pads are right down on the service limit of their thickness). You might also want to try a softer pad compound to get a bit more feel. Finally you might need to drain and bleed the hydraulics -I'm suggesting draining rather than just bleeding and topping up, as if you don't know what type of fluid is in the system, you don't want to be mixing different types of fluid.
I've had limited experience with this sort of thing, so others may have some more ideas, but I have stripped and rebuilt the system on my kart, and it seems to work. Another driver tried my kart recently and despite only having a pretty old and basic Righetti Ridophi caliper coupled with the old-type Tony twin master cylinders, he said it stopped better than his Kelgate-equipped kart...so I seem to have got mine working fairly well.
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