Before you go trying to add springs to the calipers, you should make sure that you've greased the slide pins, lubricated the piston, and checked to make sure that there are no fluid leaks or other problems with your calipers. That's preliminary, because I can't advise you to make your calipers do something they don't normally do without making sure that they're safely operating on their own.
There is also a problem with adding springs to the pads to push them back. Once they begin wearing, the spring will keep pushing them back just as far, so the actual brake surface will be further away from the rotor as they wear more, and eventually, it will effect your brake pedal feel. I'm not sure how to stop them from pressing back out too far.
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