This is intended to not only check how effective your cooling is but also to see what side is not getting the air flow it should.
For testing purposes disable any cooling print speed slow down. Slopes are at 45 angles so it should be very printable other then any cooling issues.

I have found on my printer that the first of the three levels had better cooling then higher up, I think this is due to some air reflecting off the bed and helping with the cooling, so for a true test I recommend printing the entire model.

In the before and after photos the left is before adding hotend insulation and right side is after. No fan changes yet.