Maybe you are dehydrating the goo with fesh EA? Fresh EA may be absorbing water.

Resting the extract in the fridge before salting will get water out of the EA (water solubility in EA goes down with temperarure). The current TEK suggests this for newcomers.

I think you want the xtalization temp to be greater than or equal to the resting temp. This way, I think water will remain dissolved in EA. I would not xtalize at a lower temp than extraction/resting temp because of the risk of water dropping out of EA when colder and potentially mixing with the crashing product forming goo (possibly).

Edit: I wonder if a source for goo is resting/decanting in a warm environment (e.g garage in the summer and then xtalizing in a colder environment where water will come out of solution (e.g. A/C house or fridge). There may be a buffer because citric acid mono hydrate could absorb water amd form a higher hydrate in solution, which may explain why goo formed in some examples that did not have excess citric acid.