Hi Florence,
Sounds like a mighty expensive way to improve (maybe) your front brake, I had a Kawasaki Mach III with a TLS front brake and was glad when I swapped to a CB750 with a front disc. What have you tried to improve your front brake, have you rebuilt your master cylinder, or considered changing to a more modern one, how is your caliper piston/seal have you got braided hoses, is there any air in the system (fit speed bleeders is a good idea). Unless you spend a lot of money on a racing TLS it might be cheaper to overhaul and upgrade your existing disc.
Cheers
Den