Re: How much heat sink?
If I understand your post, you took the bottom of one of the blown ssr's and added it to the bottom of the 60A ssr, then added a cpu heatsink? Are you using a thermal grease between the heatsink and ssr? If not you may not be getting good contact between them.
Most heatsinks are copper or aluminum so if you added an extra base that was steel you may actually have impeded the heat dissipatation process.
One other thing you might look at is the actual amp draw. If you have an ampmeter you might want to verify your draw.
Are you sure your wiring to the ssr is correct. Is it possibly you're shorting out the input contacts to the ssr somehow?
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