not to sound redundant but you have issues that are breaking the rockers. spring surge, insufficient spring pressure, interference of some type. no way you should have that many failures. do you know what your spring pressures are, part number, retainers, spring rate, installed height, open coil clearance?

you need to fill in the blanks and post pics of the failed parts and their installation. unless it's something bizarre it shouldn't take an expert to figure it out, roller valve trains will not live with weak springs.