.001 difference from planned shouldn't make enough to cause cracking bottles. 1.020 is a bit higher than I like to bottle at, but depending on the recipe could be fine. I bottled my 999 Barleywine at 1.030 'cause the yeast were toast (at 17.5%!!!  ) I've noticed that most of the extract kits I've done have finished fairly high, around 1.017-1.020 and no cracked bottles yet.
How hard did you lay on the capper? I have actually cracked the neck of a bottle while capping. I also got a few bad bottles that the neck snapped on when they were opened. The cap stayed attached and there was a very even break all the way around the neck. I really hated pouring those beers down the drain, but didn't want to chance that glass had gotten into them.
Terje
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Primary: Burned Mead
Secondary: Bourbon Barrel Porter
Bottled: More Bourbon Barrel Porter, New Pekin Common, Flat Tail Old Ale, Bad Monkey Banana Wine, Flanders Red, Pumpkin Ale
Drinking: Too Much
On deck: Something crazy to use up the 3+ pounds of hops sitting in my freezer
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