Got my nailbender dropin today. fast turnaround, considering it came from the US

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I wish I had gone for the cool white now, but its better than purple

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The front of the reflector was not flat at all, does this matter? it'll just be touching the glass at 1 point as the was a mile out. Quite surprised about that as the one I got with the ultrafire dropin was perfectly flat.
Also I shimmed the torch using aluminium, with thermal compound in between. The new dropin is very tight in the housing, so will this be a better solution that using the copper foil tape?
Also, I've noticed there is still a slight tint around the edge of the beam. Could this be due to the lens? Any recommendation of a decent lens to replace the stock Solarforce L2T one?