Also remember to check after undervolting and overclocking that your DSP is still working. The device can work otherwise fine, but DSP acceleration no longer work for example in Mediaplayer.

For my device this combination seems to be the best and if I try to squeeze any parameter "better", either the device crashes or DSP starts to have hick-ups: LV-profile, 250-900 Mhz, vdd2 SmartReflex enabled but vdd1 disabled.