If that tank is about 10 inches high, as I think it is, you have more light than you really need. Two DIY CO2 bottles can give too much CO2 for such a small tank, depending on how big the bottles are. But, the real issue is probably that the high light and CO2 is driving the plants to grow fast, but you aren't dosing the nutrients they need to grow that fast. You should be dosing NPK and trace elements, but you are only dosing trace elements. Read the sticky on dosing schemes to learn about the easiest, cheapest and best way to dose. Your pH isn't a problem, but if you want to breed shrimp, you shouldn't use more than a small amount of CO2, making the use of low light the best option.