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You may want to double check your crank/flexplate. I can not say the same for ALL of the B/RB motors (because I don't want to mislead you), but I learned with my 440 that my cast crank was a external balance. When I went with a steel crank it was internally balanced and I needed to purchase a...
If the lifter simply bleeds down, this doesn't explain the variance in balance from lower to higher RPM. The engine would run rough but it should not cause the vibration only at one rpm range.
First, you need to isolate the problem to be sure it is the motor. Did you disconnect all of the belts...