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Almost any of the lilly pillies will do. If you hadn't started I was going to suggest Golden Penda. Definately plant one between the existing one. The additional competition will help keep them from growing too big. Even the scrub cherry (Syzygium australe) is a huge tree in the bush. As I said before if they get too high, chainsaw them back to a managable height. Just cut the central trunks out and leave any upward growing branches. They'll then become new trunks that you can cut back later on. If you water them regularly (Lilly pillies like good water to get them growing, but will do without when they mature) and lightly fertilize them with a low phosphorus fertilizer, they'll reach 6 meters in 2-4 years, NP
Golden Penda though only grow to about 6-10 meters and you can really hack into them. The more you cut them back the thicker they get. Syzygium will too but not to the extent of Pendas and not as fast. To keep either of them healthy though keep your hedge to around 1 - 1.5 meters thick at the base and sloping in towards the top at the sides. This is to make sure all the hedge gets good light from top to bottom. Otherwise you might start to find it getting bare patches as it gets older.
Good luck with them. Oh and make sure you mulch them deeply (straw mulch at least 75 mm thick) out to about half a meter from the trunks, but keep the mulch from coming in contact with the trunk. They will grow quicker than unmulched.
Lilly pilly fruit isn't too bad besides the native pidgeons and possums will love them. The golden penda doesn't produce fleshy fruit. Or you can do a light hedge after flowering to remove the old flowers and developing fruit
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