.06" is big. I remember the low end of the spec being in the mid 30's. My kit had the wrong rings (choke bore vs. straight bore) and they had gaps in the upper 40's or 50's I believe (just outside the tolerence range). At 100 hours, I honed and re-ringed with the proper rings. My blow-by went down a decent amount.
If you have choke bores (you may not if the jugs are from the 60's), be sure you are measuring the ring gap in the correct part of the cylinder. The ring has to be pushed quite close to the top of the cylinder to get into the smaller bore area. The Lycoming manual gives a distance from cylinder top for doing the measurement.
I would also be sure that they didn't put choke bore rings in a straight bore if you have already been measuring the gap in the proper location. You will need a bore gauge to check. I believe the choke taper is only around .020 - .030.
The choke thing is tough to work around, as you only typically see straight barrels manufactured in the 60's and re-worked. The terminology used by the PMA's is very unclear and they don't talk about the choke, only cylinder material. It took me a while to figure out which rings were which. Also, if not careful, the overhaul shop can take out the taper when they bore or hone a choke barrel..
I don't know what the protocol is for chrome jugs. For steel, I honed with 220 grit stones and I believe that that is the old standard. I would guess the chrome layer is relatively thin and don't want to over do it. I would have finished off with 400 grit, but didn't have the stones on hand and just decided to do it the old way. I burned 1 quart in 20 hours for a couple of hundred hours and it has settled at around 1 quart in 15+ hours.
Good luck,
Larry