Scott, I may have missed it in all the posts, but what is your bubbles per minute or per second rate?
With DIY you need to monitor this closely and when you see it drop off, even slightly it's time to get a new batch ready.
As suggested, put a piece of filter media, either floss or a sponge cut to fit, over the outflow of the HOB.
The biggest issue with the ladder is keeping it clean. Every couple of weeks or so give it a bleach bath and clean well so the bubbles don't stick to the ramps. If you do that it is very effective, IMO.
If you don't mind the look, a 2ltr. bottle works well, but then you may have issues with leaks. Probably holds more solution.
Seal the top well. I used to use bulkhead tubes(used for model airplane gas lines) on my tops and never had a leak.
Len