yes, it's safe. I always experiment with the different taps on my Mac. There is nothing bad that can happen from this.
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Using a lower impedance source is not a problem. A problem would exist using 4 ohm speakers on a 8 ohm tap. THAT could damage the amp because too much current can flow through the speakers and the amp would overheat, or blow fuses.
What you are doing is fine, and may deliver a bit more snap, or sense of aliveness.
I have another question in line with this discussion. With a 6 ohm rated speaker having separate bass and m/t connectors and using a mac amp can one use both 4ohm and 8ohm of the mac in a true bi-wire configuration. Such as hooking the 4ohm to the bass unit of the speaker and the 8ohm tap separately hooked to the m/t unit of the speaker.