That bioload looks more like for a 12ft tank. Do keep in mind that fishes will grow & bioloads will increase as a result. Will your liverock be able to cope with such increases in bioload? You also need to keep dissolved oxygen levels in mind, the dissolved oxygen levels in seawater are far below that of freshwater. If you put more liverock, you are effectively reducing your total water volume, meaning the more rock you add, the more your fish is being cramped in water. This can be disastrous if you have many fish. Dissolved oxygen levels might not be able to be sustained in limited water volume. Do note that nitrifying bacteria use up oxygen as well, not only the fish.
I would recommend that you lower the fishload by at least 50% to take their growth into account. Also remove the trigger as it will likely end up pestering your tank mates. Use a skimmer with a high turnover rate, beckett skimmers are well-known for this. If it is a fish-only tank, run it at half saltwater strength, 1.010-1.012, to reduce your risk with pathogens and also to increase dissolved oxygen levels. Get a dissolved oxygen meter. Levels of D.O should be between 6-8ppm. If dissolved oxygen levels drop below that, you are overstocking. Run a good UV unit to safeguard your fish against parasites.
If you can, invest in a chiller. It will lower the metabolism of your fishes and wastes will take longer to break down, giving your protein skimmer more time to extract the wastes. Overall your water quality will improve as a result.