diy sheet metal reflector for cfl ?'s

I made a reflector out of flattened duct work (7" round) so i believe it is roughly 21" by 40" long I bent it into a batwing style and put 4 y-connectors therefore 8 26w cfls. I am in the process of replacing with 42 watters just the 9$ difference per bulb is slowing down this process. My question is is this 26 gauge sheetmetal a good reflector or would it be a good idea to line it with mylar or paint it white or is it reflective enough? I also have a few of the 10" parabolic reflectors to help with my lighting and my entire grow area is now wrapped in mylar (finally found some) any help is appreciated thank you

Where did you get the duct work at? Local store shop? Ur setup seems perfect to me, temp wise and such. Flowering you might add some more lights imo.