Son of a....broken rocker.
#6
Ya think it was the infamous YT rock failure or something else caused it?
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#9
It is always better to have more spring pressure than too little spring pressure. Curious as to what numbers you're currently running as well.
As far as saving the heads it does look feasible assuming there is enough area under the valve seat to remove, check for square, repress, and regrind. The rest of the head should not be too hard to blend....just very time consuming/tedious in effort not to overheat the head causing it to warp.
I'd also go digging in the bottom end to find the roller. Curious as to whether it has a flat spot or shows signs of discolouration due to overheating of some sort.