Brake levers?

I have this same setup.
The goldfinger lever fits FUji bars fine by the way:)
The problem is that my braking force sucks.
The cable is a bit longer then in the thread photo.The lever needs really lots of force to be applied, and still wheel cannot be locked if I am in motion.
Had a ride on my geared bike yesterday and brake there almost caused me to perform artistic over the bar tumble.
What is wrong?
I noticed that when I pull the lever, there is a bit of click at the last stage and the cable moves a bit towards the bars, right by the ending.
Shall I make my cable longer or switch to left hand maybe?

Drop bar levers have more mechanical advantage than flat bar levers.

re. the cable moving, it sounds like your cable is not seated properly at one end. Take it off and insepect where the cable sits and the end of the cable outer. Is it cut off cleanly, you may need to file the end to get a nice clean finish. use a ferral if you have one too.