Is it true that the lower the viscosity of fuel oil, the better?

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The company has developed a new heavy oil burner that requires a kinematic viscosity of 5 centistokes for the heavy oil. We used anthracene oil from the tar industry as fuel, and steam atomization was employed; the measured kinematic viscosities were 4.597 MM2/S at 80°C, 2.918 MM2/S at 100°C, and 2.109 MM2/S at 120°C. This means that the requirement is met at 80°C, but it is understood that in the industry, heating is usually done to around 160°C. The question is, for heavy oil burners, is it true that the lower the viscosity, the better? I remember when I first started working, an experienced colleague said that too low a viscosity wasn’t good either. It was several years ago; I’m not sure whether he was referring to mechanical pressure atomization or steam atomization at that time As I understand it, with mechanical pressure atomization, a viscosity that is too low might not be ideal, but with steam atomization, the lower the viscosity, the better. Right?