Slinky is such a dear heart. Of course he wants more. In nature they pack it in when they can because there may not be another meal for weeks!
Just keep repeating to yourself, "less aggressive feeding is better for my snake's health long term." I know I had to. When Dolly was on single pinks it seemed like he hardly grew and it was sooooo hard. Now, six months in my care, he's packing it on even on a six day feeding schedule. According to Munson he could be on hoppers, but I'd rather delay the hopper jump (forgive the pun), so he's got 8 more large fuzzies every 6 days, not counting shed fasts, on the menu. Last weigh in was 53 grams. I have the hoppers and weanlings ready in my freezer

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Slinky will get there before you know it. Go Slinky!