Could someone help me with Breath support issues on the flute?

Hmm. Without sounding presumptuous, may I suggest taking it back to the basics? Have you consulted your flute teacher about this? And also, when is the last time you serviced your instrument? I always had great success with tone and support with careful practice of the Trevor Wye method books. I believe you may have issues with diaphragmatic support and lip strength. My university flute professor suggested holding a tiny coffee straw between the lips and blowing in it for as long as possible, several times a day, every day, in order to build those tiny muscles. In terms of breathing, do you have allergies/asthma? I suggest that you get those in order if you have concerns with diaphragmatic support. One must consider all facets of a problem like this. Good luck to you :)