Yes, you may calculate the actual wash sale based on the amount repurchased within the 60 day window (30 days before or 30 days after the sale).
More or less stock bought than sold. If the number of shares of substantially identical stock or securities you buy within 30 days before or after the sale is either more or less than the number of shares you sold, you must determine the particular shares to which the wash sale rules apply. You do this by matching the shares bought with an equal number of the shares sold. Match the shares bought in the same order that you bought them, beginning with the first shares bought. The shares or securities so matched are subject to the wash sale rules.
This may require a bit more review and calculation on your part based on the dates of purchase of the stock.
@TodS
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