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Generally, for simple coils that heat up quickly, there isn't much need. For builds with a large mass, a lot of metal, a high preheat gets that larger mass up to temp, and then the lower wattage/temp control takes over to keep it heated up. Do you prefer a warmer or cooler vape? If you want it warmer, maybe try hitting it with 60W preheat and leave it at 40W after. In truth, after getting to temp, you will not need as much current to maintain the temp, so you might find 30 or 35W is better after the preheat. (Moderator edited out advertisement)