I'd recommend talking to a business consultant or coach, preferably someone with experience in your industry. As someone outside your industry, I would recommend that you think more about how you can consolidate into fewer brands. Managing five brands means splitting your resources, time and money to the point where, as you yourself have said, no single brand is able to shine. My advice to you would be to decide which brand has the best opportunity to stand out and consider focusing your efforts on that one brand. If you want to talk further, feel free to contact me.