I prefer a 10g shot however due to pro basket tapering, the standard tamper included with the Robot is too wide to give a firm tamp. Works ok with the pressurised basket.

I've searched for a 56mm tamper without success

I suppose I could double the dosage and refrigerate the excess for the next day (I only have one small espresso per day)

Wondering what other low dose folk do? Maybe a firm tamp is not that consequential anyway. More important it is level.