If this is of any help. Last night I developed some 4x5 Ilford Delta 100 some of which was shot with a pinhole with exposures up to 10 minutes and some with my 4x5 with exposures up to 25 seconds and some less. I developed the film in Pyro PMK @70 degrees F for 22 minutes and got great looking negatives with what appears to be consistent densities even of the same subject which also happens to have been flowers -- tulips both orange and white ones. They were shot indoors with reasonably strong light coming through a sliding glass door but not the same day and with variations in the light. One was of a pineapple that is also in the color range you seem to have.

http://www.jeffreyglasser.com/