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You shouldn't need a wider reception pattern (beamwidth), all your major UHF stations from Seattle are within 20° of each other (150-170° true).
Yes, an 8-bay has a narrow focus, roughly half that of the 4-bay. That's how higher gain is produced, that is, by narrowing the focus in one direction while giving up reception in others. Think about how an adjustable flashlight, a Maglite, for example, works.
If the antenna has been aimed to 160° true and you cannot pick up all the UHF stations from QA Hill and downtown, you have a siting issue. I'll just blame it on the trees since there's nothing else in the information provided that will explain it.
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