I think my biggest problem has been time. If a recipe calls for a 2-2.5 hour cook time, then you should be mentally prepared for a 3-3.5 hour cook time.
Has this been recent cooking or cooking last summer, thinking height of the sun in sky at this time of the year which is lower versus summer when it is higher in the sky.
I actually believe that that might have been the issues. Both times we tried it we were at anchor and I noted that the boat's swinging in one instance. I can't recall whether boat was swinging the other time. Will be more cognizant of boat's attitude to the sun next time. Maybe deploy a stern anchor during cooking time? Thoughts?