According to Bang Din, seems it's worst and he keep on remind me don't simply adjust the springs anymore.  i still remember that's somewhere body near tremolo inner area was crack he told me. but it's not visible at outlook. Sorry for i have no idea how crack was it. i may afraid i am doing more and the worst may lend to me.

here is the springs. not sure i still can add on?
[attachmentid=3305941]

firstly, that is one ugly looking trem block

but are u sure cannot add more springs? u dont own a screwdriver?
but assuming cannot add more springs due to that fugly block, and since u say the screw cannot tighten more, and that fugly block and claw holder cannot add more springs, then move the springs like this.


that should help abit, if cannot, then u have to send guitar to someone repair the crack.