"I am not sure why the NFVA discount the openings so much, is it to factor in louvers and grills." ------ Yes!
The eyebrow vent is short-circuiting the gable from drawing air from the soffits.
The WHF should not be a problem as it is an exhaust. BUT, sometimes gable vents act as intake and exhaust vents. The very best would be a continuous ridge vent with baffles at 18sq.in. per ft. and continuous soffit vent at 1/2 that number per ft. (times 2 sides)
Air sealing an attic is very important: http://www.rd.com/how-to-seal-attic-...icle18158.html
Be safe, Gary
Clothes taking longer to dry?
Clean the dryer screen in HOT water if using fabric softener sheets.
They leave a residue that impedes air-flow, costing you money.
Clean the ducting in the last six months? 17,000 dryer fires annually!