The "cure" hasnt passed. Curing takes weeks, sometimes months (personal preference). The cure is not based on hitting a certain humidity percent.. so while your jar is in the 50% rh range, the buds are still curing. The purpose of burping is to exchange fresh air in the jar. While the jar is sealed, the buds are releasing gasses and evaporating water (thus the rise in rh).. "Burping" releases those gasses from the jar, replacing them with fresh air, allowing the process to continue. I would personally burp once a day until the rh stabilizes, and the smell is as pungent as possible. This could take weeks, sometimes months.