Yes, the JLF is a loosey-goosey. I’m guessing you’re transferring from the tighter, American-style Happ sticks?
One thing people have done a lot is add an LS-33 spring or LS-55 spring to make it tighter. It’s a pretty cheap way to add some tightness.
Some people have said the best way to emulate the American feel is with an LS-33 spring added to the JLF spring, a Toodles GT-C circular insert restrictor, and an LB-30N Sanwa Bat Top (with Bat Top adaptor). Now, whether it really works, I don’t know. I prefer stock Seimitsu sticks on Square gates with Balltop, so I’m fairly opposite.
i concur with the above posts. I have a ps3 TE-S. i switched to an LS-32 and did the home depot spring mod. added a bat top for leverage and now no more looseness. also changed out the pushbuttons for seimitsu since i didn’t like the looseness in the buttons.