I have measured individual bearing shells by the dozen, and matched up the ones that give me an exact oil clearance, but I've NEVER used two mismatched undersizes!

If you know you've got a questionable rod, just swap it out. Most decent parts stores should be able to order one reconditioned rod for you.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!