I tend towards roof venting without power but Im not sure if you ever stated whether your HVAC system and vents are in the attic.
If not then it's a no brainer to insulate and plenty of roof vents.
But the question becomes dicey if your system is up there and not under the house. I know, I asked myself that for 16 years as mine was in the attic, two HVAC units and all the ductwork. I never did a power fan and since the home was new 16 years ago venting was adequate but it does get hot up there. 110 to 120 not our of the question.
Anyway, that was then, just sold that house but now moving to a smaller home with the same thing, HVAC unit (one) is in the attic.
On the new house there are a total of 12 vents at the top, 4 vent on each of 3 sides. None facing the street. It could be as little as 10 vents. I cant confirm since I didnt take a photo of the side, so for some reason I think it can be as little as 3 or maybe the same as the back with 4 on the sides.
This is our home under construction, soon to close.
View attachment 143867