That's the same thing I did! But you used two layers? Mine was 2" thick and was perfect with one layer.
My insulation was shipped all the from Phoenix to Ohio. Lot a good all that eco greenie happy-feelgood labeling on the recycled denim did.
Less whining from my UPS guy tho. The box was big, but it wasn't a heavy one.
I'd post pics, but I don't have a model to throw in there. Nobody would want to see me.