Again, never had this issue, we have tables installed on our all exit row seats and I'm yet to see/hear of one falling down. How small are the latches????? Unless they are breaking off all the time or not latched properly it would seem strange.
What you've highlighted in this post is a number of safety concerns you have as operating crew, it would be best for you to use your companies safety reporting system (either confidential or otherwise) to bring them to the attention of your companies QA department.