I never ask for more I ask for a larger portion, to start with. Hence my comment about the 35 night cruise. If you find the portions to be too small the first night then you can do something about it for the resat of your cruise. It also will help with waste of which on some lines must be huge.
I have to say in general i find the smaller portions, and I am not convinced they are that much smaller than over the last 20 years suit me fine I do not remember one person in discussion actually saying anything about portion size