To switch on at the minimum dim level below ~5% will always not work perfectly; this is due to dual PFC IC design as well as the surge protection incorporated in the driver. When you turn on the light, the input voltage is charging for the VCC first. Once the VCC voltage gets up to 9V, then the lights produce light. When the dimmer switch is set to 100%, the input voltage is 230V, the charging time is only half second. But if the dimmer switch is set to its minimum, the input voltage is just a trickle then charging time will increase to tenfold, and the small differences in each capacitor becomes more prevalent making each one act a bit more random to each other.
The trade off is if we dropped the Dual PFC and massive capacitors you would have power ripple flicker, low refresh rates and flicker on cameras, low compatibility, non linear dimming and short lifetimes. We went for those over the fast startup/switch on at very low dimming levels