V4 engine rebuild

Just bought 2 Sonetts-- got 2 spare V4 engines. I'll be building at least 2 engines. From reading on the net, it seems the balance shaft on these engines is a weak link. Is there a good way to extend the life of the bearings? I've torn down one engine and all the bearings except the balance shaft inserts looked ok. I'll plastiguage them later. Would it be a good idea to drill the new inserts where the two holes go through the bottom of the block casting? Maybe just a good synthetic oil will be enough? Anyone have good experience with this? I know I'll be getting experience, I just hope it will be good!

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