Overexposing paper negatives outdoors
I did a search but could not really find what I'm looking for, so please excuse if this has been answered to death.
I've been shooting a lot (a lot) of paper negatives lately and have had really good results working under controlled lighting situations in my studio. (living room) As soon as I move my setup out of doors, however my exposures are very over exposed, even though I am using the same metering process indoors and out.
A few details: I am using an 8x10 Burke and James with a 5x7 back and shooting on single weight Ilford RC glossy paper. My light meter is a Gossen Luna Pro. (In my opinion, none of those details should make the least difference in indoor/outdoor exposure)
I have tried reflected vs incident reading, I have tried metering off the brightness of the sky, (which should have resulted in severely under-exposed paper)... no luck. Everything is coming out 2-4 stops over exposed. The shadows, which should be nearly white on paper, are an almost unprintable mid to dark grey. It's almost as if the paper is being fogged. But why would this be so out of doors and not indoors? (The paper edges where it is protected by the film rails are pure white as expected.) I have checked my bellows and find no light leaks, so I seriously doubt this is the problem.
Can anyone tell me why I should not be getting similar exposures indoors and out? I have wasted far too many sheets of paper on this.
Thanks in advance,