Follow the rule of power injection after about 100-130 for 12v, and 200 for 24V individual pucks . You can get away with using more lights if you reduce the brightness. Power injection is NOT an exact math, requirements will vary with factors such as cable length/quality and other environmental factors.

If you encounter issues such as dimming or uneven illumination after implementing power injection, check for loose connections, inadequate power supply capacity, or incorrect placement of power injection points. Measure voltage levels at various points along the circuit to identify areas experiencing voltage drop, and adjust your power injection strategy accordingly.Check for blown fuses, the controller contains fuses to protect the circuitry and from over current and will blown if wired incorrectly or  loose wires touch each other.  If problems persist, consult with a knowledgeable technician or electrician for further assistance.

We discourage against this as you will exceed the bandwidth of the wires hence not supplying enough power and defeating the point of power injection. Furthermore , our controllers have a safety fuse in them so if you try to draw more amps than allowed , you will break the fuse and will need to replace it to resume operation. This is for the safety of the system 

Depends on how bright you want the lights, you can get away without power injection if you run the lights at lower brightness levels. If you have shorter cable lengths from controller to lights, less power injection is needed as well.