I'm struggling on this thread - you want the "ultimate in reliability" and go to the trouble of balancing and purchasing nice forged pistons, but you are having your mechanic re-use your old liners and without any glaze busting/re-surfacing? Why is that? What piston->cylinder clearance do you have across those liners? Has that been measured? As previously highlighted, the OEM pistons/liners are provided in two size grades, you could end up with wrong clearance when installing the piston. Same with the ring gapping that would have been necessary.
I don't want to come across as being a critical old fart, but some of these decisions make no sense to me.