Yes, I do change the lot sometimes because if I buy it later at a lower price after my first buy, sometimes I might want to sell the second shs for a profit when the sp moves up even if it's less than the cost of the first shs I bought. If I sell the later shs, I won't be selling for a loss. If the sp happens to keep going up, I might be able to sell the first shs I bought for a profit also. Sometimes that helps a little if I plan to keep trading the stock and don't want to create a wash sale. As you probably already know...
The wash sale rule prevents you from claiming a loss on a sale of stock if you buy replacement stock within 30 days before or after the sale.
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