Just my take on your gun. Parker ejectors use a v-type flat spring not a coil spring and such springs typically don’t get “weak”.
I really doubt any amount of cleaning with this or that solvent or oil will resolve the problem.
Are you sure the left fired shell isn’t hitting the breech face (ejecting too early)? Try ejecting a shell by opening the gun VERY slowly. Even then the fired shell should clear the top of the breech
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