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SWR is a static (non-varying) value:  it does not increase when you increase the power unless there's something wrong with the antenna or feedline.

 

Inexpensive (okay, "cheap") SWR meters compare the reflected power with the forward power, without modulation.  You have to adjust the meter after each power change or significant frequency change.  There's no reason to measure SWR in "peak".  Once properly checked it's not going to change unless, as I said, something goes wrong with the antenna or feedline.