It might be a simple question:
Does 1- point Customization Aegis Improved Armor
- The astral suit thickens and strengthens, increasing the aegis’s Armor bonus by +1. This customization can be taken once for every five levels the aegis possesses and stacks with any Armor bonus granted from the astral suit itself. The aegis must be at least 5th level before selecting this customization.
and normal armor such as Half-plate armor stacks? So at 2 level result: AC 8+1=9