Torque to recommended 15 pounds. However likely to dimple paper thin as you describe it, Milodon(I agree miserable flange) oil pan flange. Often pans are cinched only to 5 to 10 pounds as many are concerned to damage their pans, hence the slathering of silicone. A good gasket and proper torque, you should not need this. What did Chrysler do when the built these engines, I don't believe they used silicone,,,,was it even around then?

Using 1/8 inch by 1/2 inch steel stock, this has worked for me. No sealer at all except at rear main retainer. You can buy strips at any hardware store.

Also makes for a much easier pan R&R next time.