I run supports and support interfaces at 90% flow. That makes them weaker and doesn't affect the rest of the print. Those settings are in the Material section.
You can also set the Support Infill Layer Thickness to 2X your regular layer height. They only print every other layer that way. I usually do that with the infill as well.
There is also a setting for Gradual Support Infill Steps that will give sparse infill near the bottom and increase the density as it gets near the top so your roof is supported.
Oh, I know there is a support Offset but I don't think that would help much and there is still The issue of printing thicker supports than needed.
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