Oil level question

The Dart has a recently stock-rebuild 360. I have a mid sump new stock replacement pan, the good quality Milodon one, not the cheapies on ebay. I noticed after the first oil change (5 quarts) that the oil on the dipstick shows about 1/3 of a quart low.

I am using the short filters, no 90 degree adapter. Also the dipstick is a new stock replacement one, not the cheapie chrome ones or anything.

I changed the oil again last week and after 5 quarts the dipstick shows about 1/3 of a quart low again.

My question is do I go with the current dipstick reading or re-mark it? I'm wondering if anyone has one of the stock replacement Milodon pans? Maybe they're slightly deeper or different shape? Maybe the new replacement dipstick is a little off?