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Likely, the downslope and upslope are causing the difficulty. They may be triggering a longer / shorter duration between pulses depending on the trigger level. If the average over a half second is good. there is not likely to be a problem in the long term. If one wanted to play with it on their own, there are a few ways to normalize the signal. But if, as you say, the 1/2 second average is good, that is the best solution.
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