relax the age is to short to get decent science and way to short to have learn be a major factor.

Warring kingdoms will have to seek wars in earnest while growing kingdoms simply won't have time to catch up later on if going full ham on abducts. Since it is only books that will be taken a few abducts does nothing to hurt your book production, it only take away the produced books, so you still have the scentists to keep prduction high.