Someone was kind enough to tell me how to activate debug mode on the current version, so I was able to test some things. First off, 325 is the max possible with 3 stamps, I can verify it. Second, for a full clear run, if you play perfectly optimally, you will end with 13 hearts remaining, so that's how much total wiggle room you have to secure a full clear. Which, honestly, feels impressive considering how doable it is amidst those with practice. Love this game, love poking around in it, thank you for putting in the hard work of breaking it over your knee.