Don't be fooled in thinking that all bubbles counters are the same and don't get hung up on your flow rate. 1 bubble, 2 bubbles, 3 bubbles, 4.
Let me give you an example. We have glass bubble counters and plastic bubble counters. If we add the glass one to one of our set ups, it will show 4 bubbles per second - pretty fast heh. If we remove it and then swap it for a plastic version, it will show 1 bubble per second. So which is it? It all depends on the manufacturing process of the bubble counter and this is a perfect example why you MUST NOT get hung up on your bubble counter flow rate. No one cares, and your plants certainly don't. All they care about is are they getting enough CO2 and you'll only know this if your drop checker is showing an approximate green colour (don't get too hung up on that either). You're simply looking to have as much CO2 in your tank as possible without distressing the inhabitants.
So for all you lovely hobbyists who email me and say they have 2 bubbles per second and they can't work out why they don't see their plants releasing O2 bubbles, now you know!