The only time I had a foam issue, is when I used the top and bottom holes at the same time. So, I only used 18 holes in the bottom, and never filled the top. I wouldn’t want my yo-yos sitting on top of each other anyway, so that worked best for me. That’s one of the reasons I prefer to make my own these days.
Thanks for the heads up about the Benchmarks. I haven’t tried the 2014 versions, and I’m not sure if I’ll check them out. I have the old set, and agree that the heavier side effects are better.