This is not a problem of too much power. It's a problem of a very localized dead spot for one particular frequency caused by its unique signal path to the spot where you placed the antenna.
I run into this all the time. The solution is as simple as it is annoying for the customer to hear.
Move the antenna and try again. It might take a mere 6 inches, it might take 6 feet or it might take 6 yards. You might need to raise the antenna or you might need to lower it.
You will need patience and persistence. Don't drill any new holes until you're happy with your newly selected location.
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