Hi Lane -
We experienced the same situation back in the first week of May (huge trusses with growing tips) - with the same questions. I can't address the question as to why we had growing tips (we also prune suckers) but we pruned off the growing tips and took the risk of possible small fruit and let the trusses do their thing.

Here are examples of how the cluster look today. Most of the blossoms set fruit - some of the clusters had 8-12 blossoms. The fruit size appears to be developing fine - but you can make the decision to prune blossoms based on our plants if you like. Based on the size of our fruit - I would recommend that you let them grow.

The number of fruits/truss is contolled genetically according to each specific variety.

Not all blossoms on a truss will set fruits, just an internal control.

I never prune suckers , many reasons why I don't, and after growing now about 3,600 different varieties i just let the plants do their own thing.

If I were growing for fruit size for competition, for example, which I don't, I'd leave only a fruit or two on each truss, but that's the only time I'd do that, and as I said, I don't do it.

Carolyn