I'm not sure I'd allow rituals to boost quality in every case. For example, the best 'well bound' bonus available is only +1. I'd say that if the book already has that bonus, it's not possible to get a higher bonus.
Also, I think there notion of 'going toward the perfect' is different that 'going toward the platonic form of the general category'. That is, makeing the book a more perfect specimen is really about making it a more perfect specimen of itself... not of books in general. That is to say, it is not the case that as you make 10 different books of differing manufacture (even with the same content) 'closer to perfection' that they become necessarily more similar converging on identical 'perfect books'. Thus, it is possible that a book of a particular manufacture might not be 'well bound' even in its perfect state. That is, some of what 'well bound' means is probably characteristic in the particluar method of binding, and a 'perfect' example of a method that doesn't normally produce 'well bound' might also not be 'well bound'. I suppose that it is possible that you could improve such a book such that improving 'the crispness' of the paper, the quality of the leather, etc. might result in 'well bound' even if the particular construction wouldn't normally produce 'well bound'... that is the particular construction method would only produce a 'well bound' book if the materials were 'perfect'.
IMS, I'm keeping track of 'damage' to books from use. Normally this is taken care off by the resident book-binder / scribe, but I can definitely see a ritual 'buying back' reductions in quality due to damage.
