I've never sold a huge number of paperbacks, but I've continued to see sales after the transition. Maybe I was lucky and didn't have metadata problems. Like you, Jan, I was in the "at least one copy a month" club.
By the way, if your cover artist charges to make minor adjustments, unless you are absolutely in love with what he or she produces, it might be wise to shop around a little the next time you start a series. I've worked with two people, both of whom have made minor adjustments for me for free. (I suspect that might change if I needed a huge number, but for someone who has the original files, making a minor size change doesn't seem to take long, suggesting that it may not be that much work.