TurboTax will adjust basis based on the numbers entered into the application. The numbers need to be correct so you are right to post your question.
Generally, when a company sells shares to cover, there is neither a gain or loss on the sale because the vesting and sell to cover occur at the same time. You are correct to make a cost basis adjustment. The cost basis should be the value of the shares on the day they vested. Your approach to calculating basis for the sell to cover shares seems reasonable because you multiplied the number of shares sold times the price per share.
Does your 1099-B reflect if there were any commissions/fees paid when the shares were sold. If there were commissions/fees paid in connection with the sell to cover, add those commissions/fees to your basis.
@gll
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