I've never heard of people regularly offering more just because their snakes look like they'll take it. I know people do offer refused prey to other animals so it doesn't go to waste, but personally if I did give a second rat to a snake for that reason I'd skip the next feeding at the very least. And sometimes people feed multiple small prey items instead of one larger one, either because they have them on hand or the snake prefers that or for the variety.
But it sounds like you're talking about feeding a single appropriately-sized meal and then saying "hey buddy, still hungry? Have another", aka feeding the snake twice what you think it needs to be eating. I certainly hope that isn't a common or accepted practice.
Lots of snakes take awhile to settle out of the "food mood" once they get into it, so that may be why they still look like they want another one even after downing the first.
Honestly, at every 7 days you're still feeding way more often than your snakes need at the age and size you describe.
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