More info, please. What type of shaft, what spine, what weight is your bow. Too stiff a spine can cause shelf contact. Do you cant your bow? If you cant the bow more than you do your string hand, you can torque the string, which can also cause arrows to contact the shelf. It seems to be easier to torque the string when shooting 3 under for me. I have to cant the bow less if I shoot 3 under, but it is still louder, so I stick with split.
Have you tried shooting a few arrows with a split finger draw? Try it and see if you still get the tink.
Lots of things can cause that kind of noise. I get a tink noise if I wear my glasses when I shoot...not sure what causes that, but the noise goes away if I shoot without my glasses on.