We bought our boat in San Carlos and it came with flopper stopper, after the first season we gave them away as not needed. We have had Jet Skis in the one or two anchorage that I wondered if they would help. We have a double ender so don't have a problem with wave beating again the stern. I guess the anchoring in Mexico is some where between our posts.
Yes I would say that I had 3 night that I stayed up checking for anchor/drag, as the wind came up after dark, These were most likely the first night after anchoring. and maybe another 4 night s that I got up in the mid of the night to check things over, as the wind had came up. The gusty wind you described I can only remember once but I do remember all the great night I had.