Where is the Arduino in the project?
Should I cut the 5V trace (highlighted in yellow on the schematic zoom) where I'm adding power injection or leave them connected? What's the impact of this choice?
2. Is it safe to daisy chain a few 5 lead Wago connectors for the power distribution?
3. Similar to #2, is it safe to connect the resistor, capacitor, and inline fuses via Wago connectors?
4. I'm planning on using 4 amp slow blow fuses on the 3 amp sections and 6 amp slow blow fuses on the 5 amp sections - is this appropriately sized?
5. Is 18 AWG sufficient? I calculated the voltage drop and it's on the order of a few percent for the length of wire I'm running. I've read these LEDs exhibit the same brightness from ~4.2-5V
6. Any concerns with powering the Pi, HDMI-to-AV, and HDMI Splitter from the same power source as the LEDs?
7. Is the capacitor sizing and location sufficient/ correct, or would you recommend adding a capacitor at each injection point?
Absolutely not. It is most important that you supply power to both ends of each LED strip. 50 LEDs will draw just under 3 Amps at full brightness white and the foil along the strip is very lightweight and will experience a significant voltage drop resulting in distorted colour so you need to inject power to flow in both directions along the strip every 50 or so LEDs and certainly at both ends for 85 LEDs.