That seems a little extreme to me... It isn't unusual for the vent to not open fully; it is the nature of the beast. You give up vent capacity to get all-weather usability.
I don't know what unit you picked up; I've always used MaxxAir II covers, they seemed to allow for a little bit more air, but, they still restricted the vent cover to about 50-65% open. I've just ordered one of the new Fan-Tastic Ultrabreeze vent covers...it supposedly allows 95%-100% of the vent's capability, but, it probably sticks up much higher to achieve that type of air flow. Since I already have the second A/C unit sticking up high, I figured I didn't really have to worry about a taller vent cover...
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My 2 cents, your mileage may vary...
Don
Bronwyn
2 Cats; J-Lo and Ragamuffin
2011 Keystone Cougar 318SAB
2011 Ram 2500 Longhorn CTD HO
Built in brake controller and exhaust brake
Tri Glide TrailAir Pinbox / B&W Companion Hitch
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