I believe there is archaeological evidence that humans at the end of the hunting\gathering stage (before agriculture) were in the height range of your skeletons. I asked for references to see where it would go. In many cases height is limited by diet: there has always been a trend for immigrant peoples to the US to have taller kids due to diet. One could argure that between 6 and 7 feet is 'normal' for well fed sapiens.
As to taller 'giants' you may want to look at some other sources. A book that has some ideas on the bases for some mythological creatures is:
She discusses Cyclops briefly - the book is mainly about the basis for griffins. A good read, imho.
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