25 is the max limit if you don't have a bomb-producing dragon (BPD). If you have a BPD, you can collect and store more than 25.
I'm skipping this ugly guy, too, and I don't have any BPDs. We usually get about 30 days to collect pieces for a mining dragon. When I skip one, during the first two weeks of collection I aim for keeping between 10-15 bombs in storage. I use up any "extras" to mine for food.
When we get into the last two weeks of the 30 day period, I let the supply restock back up to 25. Then, I use up just enough bombs to make room for the incoming, new ones. Like, if I put a 17 hr Cloud Dragon in evo, I'll then immediately go use up 5 or 6 stored bombs to make room for the new ones (we get 1 bomb for every 3 hrs of evo time, so a 17 hr evo yields 5 bombs).
This way, at least I am getting food for those extra bombs instead of just letting them disappear. And, 500-1500 food per bomb can add up quickly.