PYRO\Ilford MGIV\Aristo cold loght

I am using Pyro(PMK) wiht HP5+ and Ilford MGIV and an aristo cold light. Since switching to the cold light there has been a noticable drop in the contrast of my prints often requiring me to use at least a #4 filter I am already processing my films at 16min@70deg and hesitate togo higher. Is this just the way it is with a cold light and MGIV or am I doing something wrong?

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