I wonder if it would be possible to silicone these holes and poke new holes?
Silicone is more expensive than hose. Bubble hose is only slightly more expensive than regular hose.
Once in a while DIY isn't a better choice. This may be one of those times.
Looking at the pictures, your holes are definitely too big. I don't really have any tips on how to put smaller holes in the stretchy hose aside from heating a pin but I can suggest that the more holes you have the better and you want them to be as small as possible (air is smaller than you can see, and so can the holes be). the elastic nature of the hose is probably stronger than an aquarium pump so simply pushing a cold pin through will probably never work, while melting a tiny hole likely will. Tiny!