Kaidenjohn,
Is it possible to put the skimmer in your sump? Even if you had to get a bigger sump?
I have mine in-sump just to eliminate that potential problem. As you are aware, when the skimmer “goes nuts†it pulls out a lot of water and the top-off replenishes it. If you have an unlimited kalkwasser source, well, you know the result. Even if your top-off was just pure freshwater, it would dilute your salinity to possibly dangerous levels.
If you skimmer sits in your sump (without an external collection cup), when the skimmer goes nuts; yes, the collection cup will overflow, but it will overflow back into the sump. Since that water will go back into the sump, your water level will remain stable (You haven’t lost any water.). Yes, all that gunk will dilute and go back into the sump and display tank, but, so what? If it pulled it out once, it will pull it out again after you empty the collection cup and the skimmer settles down. I don’t believe that cupful of gunk will cause any problems compared to diluting your salinity or spiking your calcium, alkalinity, and pH.
Doing it in-sump also eliminates the soaked carpet possibility due to the collection cup or its collection container overflowing.
However, back to your main problem:
Skimmers usually have a reason that they “go nuts.†Something was on your hands, a certain additive, or certain epoxies. I had an additive that I used years ago that did the same thing. I can’t remember what it was. Along-the-way I learned that I didn’t need the additive and stopped using it. That solved my problem with my skimmer.
In my experience, the skimmer will start to overskim almost immediately after I add whatever causes it. Try doing things one-at-a-time for awhile and see if you can narrow down what item/practice is the cause.
Hope this helps.