So on mine with mediastreamer 1.2-12 and system-monitor-plugin 1.2 installed, SMP gives
root 46% 123M-67M free
MMC 75% 60M-15M free
RAM(+SWAP) 61% 91M-35M free (I have 32MB swap enabled)

Control panel->Memory shows
Device 2% used /
Storage memory in use 1.44MB
Storage mem available 65.5MB
Installed apps 2.36MB

So I do not understand your "Device=11% used" when mine has 2% with more apps installed?