One other item, you mentioned only printing from the Right extruder. Commonly when printing PLA, the best results are obtained with the use of a cooling blower/fan. Unless you have customized the stock QiDi blower's output duct work, the QiDi's fan really only blows air very well onto the print bed around the left extruder. Switching which extruder you use and turning on the fan after layer 1 is completed may significantly improve your prints. If you have issues with the PLA sticking, some glue stick can always help out.