Wow, people asking for the board more than the bags is wild, that says a lot.

What did you actually change in those four house rules, and was it a fix or just a nerf to the one strategy somebody at your table leans on too hard? In my experience there's a big difference between patching a broken rule and patching a player who keeps winning the same way. The games that stuck around for us were the ones we played straight, and the patched ones died just like yours did. Your mileage may vary, but I'd bet a couple of those six were never really liked by the group, just tolerated.

Fridge time beats extra yeast every time in my book. Slow and cold just builds flavor that dumping more yeast can't touch.