I have been farming Nab UQ during the Persona EQ raid buff. My average is one Ultimate Booster per run, although on one run I picked up three. This is with RDR 250% + tri 125% rolling.
I think I've picked up one, maybe two from UH Rain EQ. I guess that's pretty lucky since UQ enemies rarely spawn there.
Of course my total is eight Ultimate Boosters so maybe that's not that many data points.
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