Auto Duck & CBD Auto White Widow

We‘re approaching the last couple of weeks until harvest, which will be mostly about buds fattening and ripening, I guess. One can really smell the widows’ CBD Sweet and Sour Widow parent coming through quite strongly, as the first association and main flavor is onion chutney. What’s interesting is that the plants in the front of the tent grew notably larger than the ones in the back. Given that there’s no difference in light distribution, and I can’t think of any other significant differences, I guess it must be a microclimate issue, maybe related to airflow and ventilation. Btw., while the in-line fan is running all the time, the recirculating fan does not, and I’m using the timer switch’s random program for it. What do you folks think about this? Have you had experiences similar to this?