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Stop, stop, stop.
Right now I have your attention, I scanned through the thread so I know little of what has transpired.
I own a commercial ceiling company and part of this is providing insulating materials of differing types for differing purposes. In other words I am an expert in this field. So if you have not bought anything you could try the following.
Auspoly or Tontine make polyester insulation which is used everywhere in the commercial building sector. It is cheap and won't break down or drive you insane with itching when you install it. I would go for something with a rating of R5. It is thick about 100mm. And then line your shed with WR (water resistance plasterboard) or villaboard (fibre cement). By all means paint the roof white if you want.
Then use the same stuff to line the walls. You might loose a little room but it is really worth it. You shed will be so cool during the day, and this will help with evening cooling.
Don't use roofing insulation. It won't work properly. Don't use glass wool, it will get into everything and you will itch for hours and it will break down.
Best of luck.
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