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I am a total newbie, so take this with a grain of salt, but I have been reading a lot of pages on problems lately, and some photos of calcium deficiency look similar to these.
Like I said, though... brand new, and only going by photos I have seen recently on the 'net
Ya burn. When plants are small use 1/2 the recommended amount. If you are planting into a soil all ready with lots of stuff in it, you don't have to feed for a while. Depends on strain also.
Calmag deficiencies look like brownish spots on the leaves they're pretty distinct. To solve burn just keep it with plain water for a week or 2 and you should see that your new growth looks healthy.