I believe the smaller tomatoes are just due as dust devil said any type of stress on the plant. My latter ones have been small as well its been super dry and the heat here this summer was insane.
I have read somewhere that there is a hormone that accumulates in the growing tips, so after the first wave of fruit production and the plant starts to slow down you can top the plant. (prune away the upper most growing tips) and it will give the plant basically a second wind. So that the hormone will build up in the remaining branches and you will get more blooms and the fruits will be normal sized. I also read somewhere else that recommended the topping but the reason they gave was that the smaller fruit forms on the higher growth and that the nutrients have to travel from the roots to the higher growth and other parts of the plant absorb them on the way.
Either case I have not tried it yet as by the time I had read it it was just too late in the season but next year I will see how it works.
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