I thought I had TMAU as well, turns out I didn't. But I did a lot of research into it back then. I think some sources on the net said that low pH bodywashes were better for TMAU sufferers. Something like an Acne bodywash (really low pH) is probably best. Get the in-store brand to try it, it's cheaper.
As far as cologne, I spray my clothes and not my skin because I never know if the scent will react well with my skin. I also switched to using natural scents you can make with essential oils and 100 proof vodka. Google it if you think you want to try it. There are always fresh scents for men like juniper berries or something. When I had strong FBO, more natural products went better on my skin.
Also, the hair treatment...I noticed that if you rub a conditioner (creamy like lotion) into your scalp, it will make one's head oily and sweat more. If you use one, don't spread it into your scalp. Good luck in the heat everyone.