The drain line sounds like it's surging. The drain line needs to flow completely in a downward direction. If it rises up at any point, it will surge. If you have the corrugated drain line, try coiling it in a downward spiral if it's too long.
Went back to look at your build thread. I see you have the megaflow kit plumbing. On the top of the drain pipe in the overflow there is a raised hole on the top. Make sure it's not blocked.
Also, hard to tell from your pics but is there a valve on your drain line?
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