What you wrote is completely logical. It wasn’t an experiment on my part. I mixed a 30ml flavor concentrate at the recommended 20%, so the 150ml of liquid went into a free 100ml bottle, and the remaining 50ml went into a Chubby bottle.
After steeping it for 5 weeks, I took a photo and shared it, which is what I encountered. First, I vaped the PET one with the usual cotton degradation. It ran out, and then came the one from the bottle with the further described difference…
And everything was the same: atomizer-cotton-coil-heat and cotton. 
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