OK so i've now added the following comands to your script witch activate the last 'bad' knob i've had :
# enable the power aware CPU scheduler
echo 1 > /sys/devices/system/cpu/sched_mc_power_savings
# enable HD audio powersave mode
echo 1 > /sys/module/snd_hda_intel/parameters/power_save
# Increase the VM dirty writeback time from 5.00 to 15 seconds with:
echo 1500 > /proc/sys/vm/dirty_writeback_centisecs
# This wakes the disk up less frequently for background VM activity