My experience is that it is impossible to explain to a chinese manufacturer the improved board layout as a description of the problem and then an explanation of the fix. You will have to hand them litterally a correct board lay-out. And I can not draw circuit boards. The description of the problem with the Attiny25 based FET+7135 driver ( drop out of turbo when using low voltage leds) and the required fix is here: What did you mod today? - #2183 by djozz