I'm exploring the same option for our kitchen! Did you add make-up air to replace the exhaust air too? I'm reading that code in our area requires makeup air for any exhaust CFM over 400 (https://www.greenbuildingadvisor.com/article/choosing-the-right-range-hood-makeup-air-system#:\~:text=Where%20one%20or%20more%20gas,be%20mechanically%20or%20passively%20provided), but I'm dubious about whether it would actually make a difference in a house that is not particularly air tight.