OK - the results of the survey are in. 37 people voted and 32 said that the quantity is just right. 1 person said they wanted improvement in quality/cleanliness and the rest voted that the quality/cleanliness of the vegetables is what you expected. So, overall, it's a good result.
I will send out another survey later in the year. It will be interesting to see the results at that time.
If you have any further comments, please let me know. One idea is that we could have certain items available for additional purchase - a quasi farmer's market. For example, I know some people like a lot of lettuce - we could sell additional bags for those that eat a lot or if you're having a party, we could make additional items available. I know some people divide their share with multiple households so maybe this would be of interest.
Thanks for your feedback!