Great news!We got easy-to-pass-stool today!! No blood, seemingly comfortable and normal looking in quantity (when it's dry it always seems like it's too little in comparison to what he eats, specially considering he's only been going every few days, but I know the moisture adds volume to it so it's hard to judge).
He ate a little bit less today (2,5 sachets) but we were heavy handed with the extra water we added to it, which I figure might have made him feel full. Great day, though, we're all happy after his litter box visit lol