I use a loop when plumbing two or more sprays. I'd rather use an extra $10 of copper when the wall is open than have to...you know. If they haven't always been this way, that's one thing. Then it could be debris or mineral deposits. If they have always been this way, then you could try to fiddle with them by modifying the flow restrictors in the strongest and/or weakest sprays. See if you can find a Goldilocks solution.

My shower is 42" X 60" with the shower head at one end and three body sprays at the other end, placed at about knee level, lower back level, and just below shoulder level. The door into the shower is at left end of the longer wall (the body spray end), with solid wall to the to the right of the door. We planned it that way so the controls for the shower could be mounted on the inside of the solid wall to the right of the door. This allows us to reach in and turn on the shower and body sprays, before stepping into the shower. Believe me, even with a hot water circulation system, you don't want to be in the shower when you first turn on the water, unless you like an icy blast until hot water makes its way to the various spray heads. Be sure you can reach the shower controls while standing outside the shower. While our arrangement doesn't allow as much light to enter the shower from the bathroom side, we have an operable skylight in the shower and recessed lighting, so it works well for us. Our system has a thermostatic control with separate valves for the shower head and body spray array. This allows the body sprays to be turned off while lathering up, which would be difficult while they are spraying. A couple of other things to keep in mind with body sprays. Each emitter dispenses 2.5 gallons per minute, the same as a regular shower head. If you plan to run the shower head and three emitters simultaneously, you'll be using 4 times as much water as you would with just the shower head flowing. Be sure you have a hot water heater capable of keeping up with the demand, especially if you like long showers. Also, be sure that your plumber uses valves and piping sufficiently sized to maintain water flow with adequate pressure, and that you have a shower drain sized properly for the flow of water.

This is how I did mine. We didn't go by any particular recommendations. I am 5'3". I stood against the wall and measured the height for my hamstrings, lower back and upper back--all the places where I want the jets. Then I marked the wall. Then DH (who is 6'4") stood there and we made sure that the sprays would not hit him in any "interesting" places. It all worked out.

All body sprayers which are out of walls are swivel and tilt, by hands, like above pic. You can control water directions. In-wall sprayers are elegant, but may be fixed.