Hello, while most mosses do grow slower and are able to adapt to low nutrient conditions, they do need nutrients especially when exposed to high light. I would say the problem is with the fertilization regiment. Since you have good light, CO2 and the current plant selection I would recommend dosing using Estimative Index.CO2: 1-2 BpM
Lighting: 1.8 WpG [2 Azoo Flexi-Mini HCRI LED (9 Watts each, 6700k)]
Photoperiod: Total 12 hours per day) w/ 2 1-hour rest periods
Dosing Flourish comprehensive supplements per instructions
The Estimative Index of Dosing, or No Need for Test Kits - Aquarium Plants - Barr Report
The Flourish comprehensive is a very diluted solution and other plants such as Rotala are likely removing the nutrients from the water before the moss. This results in starvation from macro nutrients.
Outside this, not really a problem for moss, but 1-2 bubbles per minute sounds like very little for CO2 injection in a 10G.