Level 22 can also be completed without using either splitter if your timing is precise. You can have a single stream from each side going to the color in the middle and then remove the mirror diverting away from the color in each corner. Do it quickly and all four balls are charged at the same time.
Edit: this is also a solution for 23 using only one color. Maybe require that the crystals need to be active at the same time for several seconds?