Switch to citric acid and baking soda.
My recipe calls for 2.5 cups of water in the acid bottle. However For every cup of water I add to that amount the flow rate is reduced. The additional water diltutes the acid and slows the reaction.
For now im going to assume you use a diffuser. Move the diffuser closer to the water line so less bubbles gets dissolved.
If that doesnt do it, try more surface agitation. EIther by lowering your water line (if you use an HOB) or adding an airstone. Surface agitation helps the exchange of gases so should help diffuse more co2 out of the tank.
Like the other guy said, how do you know its too much co2?
Also, I hope your using 1 liter bottle or less. 2 liters is probably too much for a 10 gallon