So the issue that you’re likely having is that your Jawbreaker is quite content with where you’ve placed it. They reproduce by leaving little flesh boogers (yes, that is the correct scientific term!) as they move, and they will typically move because they don’t find something about their current location ideal.
Whether that be lighting, flow, nutrient levels, irritants from neighboring corals… or any combination of those factors, those are the things that will get them to start to wander and subsequently, drop babies (aka flesh boogers). I wouldn’t mess with lighting as that could cause more harm than good for the entirety of your tank. If that were my tank and I was trying to get that Jawbreaker to reproduce, I would figure out a way to get a little more flow directed at it. That should be enough to irritate it a bit and get it to move without causing any harm to anything.
But, be careful. If you successfully make it mad without causing health to decline you could end up with this…
This is my high light, high flow, low nutrient Jawbreaker propagation tank. This is the result of effectively making these guys mad, yet still healthy.