What is the best option for my 29 gauge roof and why is 29 gauge not on the load charts?

Good question. Seems it should be or we should advise that on 29 gauge the bracket MUST be installed to the structure and use rail. 29ga is too thin to get good holding strength with a sheeting only attachment. A bracket that fastens into a structure such as the SolarFoot or VersaBracket MUST be used.