I'm starting to suspect there might be a mechanical rather than chemical cause at play here.
Originally Posted by Photo Engineer
I just turned on the enlarger, set 105M / 95Y and the light is bright red. When I swing the red filter under the lens, I cannot tell the difference.
If I dial 60M / 50Y, the image looks more like what I'm used to seeing when I print.
The back of the Kodak paper box, incidentally, recommends a starting filtration of 65M 55Y.
Too late in the day to experiment now, I'll report back tomorrow after changing the developer.