NOT suspecting the Front Balancer.
I suspect the Flywheel, or Power-imBalance (dead CYL under load or RPM).
As for the oil leak. STOP! do a compression test on all 8 CYLs, write-it-down and report back. Rather high Positive crankcase pressure is needed to cause a BAD rear seal to leak out of the rear flange. I suspect the Oil Pan seal shifted to cause a gaping gap between the oil-pan & Rear Cap. Use the Cork band wetted with RTV there & watch where is tries to go during oil pan bolt torquing.
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