There is a contrast in the sentence but "as well as" does not serve such a function. Although is be the word you need. Although the team played well in the first half, I had my doubts as to whether they could beat the opposing team.
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Imladris"as well as" does not serve such a function.This can be used two ways 1) [ meaning of also ]: He has a lot of talent as well as great looks. 2) [ meaning in spite of how well ]: As well as the team played... This could also be stated as Even though the team played well...
ImladrisHm, l see your point Philip. lt is the (as) adj + as structure.(As) rich as he is, he is unhappy.Exactly! And thanks for pointing out that the initial as is optional.