@preefered.
Based on my one month of used, i had a similar problem and it was very frustrating. However, I found out that after cleaning the the collection cup i just let the valve open wider than i normally would. This way it will prevent overflowing in the collection cup w/regullar water. Also if U notice that every time u turn on the skimmer ull get a mini break-in-cycle. once u notice the cycle is done and ur skimmer is producing bubbles the way it should be, then just close the valve to ur desire level that u want. Hope this helps =)
This is what my 10 days of skimming looks like. Just took a pic today.