It will be fine--I have run a balancer for a Long time on all those spin and drill jobs --they are easy as pie and you would be surprised how far off they can be and still run smooth as silk It is EASY to get them done well Easy! So why fool around just get it done by them
These days rods and pistons are so close I never touch them--the folks that do and take a gram here and there are fooling themselves and just making grit to clean off It does not have to be that close