joining in the round

[Breezed]

Hi everyone,
I am crocheting my first hat in the round by joining each row, instead of continuous spirals. The issue I have is a very visible "seam" that's quite unattractive, and worse, uneven because it curves off where the increases stop.

I can't seem to find any solution I can understand. Does anyone have any suggestions on how to avoid this?? I am finishing the hat as is, but I would like to know so I can make better ones.

Thanks in advance for any help.