I'm new to the Avios to AA va BA redepmtion and am looking for a little guidance. I am attempting to book CLT to CUN for family trip in April. I have plenty of options for flights to CUN, but coming back to CLT (or any other domestic airport), there seems to be nothing available from CUN in the April 5-8 timeframe. I have found flights available a week before and weeks after, but consistently nothing that week. Is this normal (I know it's spring break, so a popular travel week), but the prices seem to be similar in the weeks before and after - so demand may be relatively similar? Any other tips?

TIA