4 flippers draw more amps than 2. It is wanting a larger 7 amp fuse in F4. This has nothing to do with your upper flipper issue. Attach some photos of your lower flippers from the under side of your playfield. There is a switch on them that gets closed when you flip that controls the upper flipper on the same side. It should be piggybacking off your lower end of stroke switch.

The solder job on the first photo is pretty rough. I can't tell what is going on there. You might want to consider redoing that. The second is much cleaner. Let's considerate on that one. With the game off, lift the playfield to service position. Set your multimeter to tone test and clip a lead to both terminals of the second switch in the switch stack (red / black wire and brown wire). Now manually move the flipper to the activated position. When fully activated do you get a tone / continuity? That is what completes the circuit and fires the upper flipper on that side of the game. The way it looks now I am thinking it doesn't make good contact, so the upper flipper doesn't flip. The wiring seems ok but someone else might see something I am overlooking. Did you replace the coils, or did it come to you like this? We might need to see photos of the upper flippers too.

Progress it a good thing.