It's difficult to say for certain how much stronger the Kiba swords would become if they were infused with both lightning and wind chakra, as it would depend on a number of factors, including the user's skill level and the specific techniques used. However, given that combining the swords with the user's own lightning chakra already makes them exceptionally sharp, it's possible that adding wind chakra to the mix could result in a significant boost in power. Ultimately, it would require experimentation and practice to fully understand the potential of such a combination.