Well, it is not just the weight ... it also makes a difference how far off the center it is....and that is also multiplied by the 2000 ro 4000 rpms which it will be turning...
Being off can really wear out those new bearings quickly and may also be felt in the seat of your pants.... but except for that " flywheel to flywheel " instructions I don't know what to suggest.
My VW turned over 2 million revolutions just going from Dallas to Houston one night...that is a lot of wear if the parts are very far from balanced.