I have been shooting large format architecture (exteriors and interiors) in the Atlanta area for just under 20 years and the best thing I ever did was decide (about 12 years ago) to exclusively use a 1 degree spotmeter and when taking my film to the lab uttering these two very scary words - "Process Normal".

I once shot an interiors job using incident readings (14 years ago) and I still am haunted by the poor outcome of that assignment. The only way to meter is with a spotmeter. I don't care how much light is falling on a navy blue upholstered chair. I only want to know how much light is bouncing OFF of that chair. Same goes for walls, artwork, carpet... you name it.

I have always had good success making a 2 stop allowance for may polarizers, but different brands so vary in density.