Note too that bulbs do not always run consistantly. They can burn brighter at times especially just before they burn out!
If you need more time just stop down the lens. At the enlargements you are operating at I challenge you to note the difference the theory implies and you will gain the controll you need to...make a better photograph!
Cheers!
Since you have a color head, the easiest solution is to dial in equal amounts of each filter, thereby adding some neutral density to obtain a convenient exposure time while keeping the lens near its optimum aperture. This doesn't defeat the purpose of the color head -- the purpose of the enlarger head is to enable you to make prints. What does it matter (other than a minuscle cost of electricity, etc.) if on some prints you waste a small amount of light? If you ever make some very large enlargements, you can leave out the ND filtration and use the brightness of the head to keep the exposures times from being inconveniently long.
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