The A320 is certified to a 38 knot gust included direct crosswind. You should have enough roll authority to stop wing striking the ground if the direct crosswind gust is 38 kts or less.
Not sure how much time you have on the Bus but when I first started the advice I kept getting was to kick the rudder only at the last second in the flare. I found that worked out horribly. Often, you'd have to kick it hard and as the 'Bus senses that kick, the wing would drop accordingly and it was usually too drastic. I didn't like that technique. What I've found works for me is when I hear "50" I start kicking in a little bit rudder. By the time the second "retard" is made I'm pretty much lining up with the centerline, power to idle, and now just keeping the wings where they need to be. I've found much better results with this technique vs. kicking it "at the last second."