I’d get a tip that’s says 4080 on it. The 40 is the angle (white tip) and the 80 is supposed to be for use with an 8.0 GPM pump so if you use it with a 4GPM pump it cuts your pressure in half. That should be much safer for working that close to shingles. And like Luke said you still have to be very careful and it will be quite messy. Id be more tempted to remove a couple pieces of the gutter guard and just use a good sprayer nozzle on a garden hose and blast it down as far as you can.
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