One more thing you can do is put some heavy fork oil in your legs. This will allow for better weight transfer onto the front tire allowing you to stop faster. You will see the biggest difference with new pads (Lyndall) next would be a floating rotor (dosnt really do much but helps cut out any squeeling) and then the braided lines.

 

HD used to put dual discs on a 3X21 wheel. that was in the old single piston caliper days. I'm not sure I'd feel good about all that braking on that tiny tire.

Rubber lines do weaken with time, but I doubt your '05 is old enough. You might try a thorough power bleeding. From time to time I will remove a caliper, force the pads back into the body with a couple of pieces of firring strip and a big screwdriver in the middle. Remount the caliper and it always has a better feel.

 

Braided lines will give you a harder feel when you depress the brake. Reason why is because the steel braided lines to not expand as the stock rubber ones do. Honestly, you can't go wrong with good quality braided lines such as HD's Diamondback lines but to get increased braking, as the poster before me mentioned, Lyndall pads and floating rotors will help the most.