Living with it
I've been just living with the screen flash. The ROM is just to sweet to give up. At some point if there it a completely stable 4.3 I may upgrade.
On a regular work day I don't have any available WIFI, so I toggle it off then reboot the phone every morning. I usually get a random screen flash everytime I manually lock / turn the screen off and that's it. With WIFI on I get random flashes at random rates and for random lengths.
Playing music invokes these random black screen wakes also, I've stuck to my old blackberry as my MP3 player...I know that statement seems extemely wrong and against all sciences, but the 9780 bold works perfect as a music player. They had the long-press song skip in the volume button well before anyone added it to Android.
If ever I find the correct ROM / KERNEL combination, or someone else figures out the problem and I find it, I will post it here. This winter I am going to get more into understanding & compiling roms + digging through code so maybe I'll find it myself...ha!
MT4G - Glacier
Recovery : 4EXT 184.108.40.206 RC8
Radio - 220.127.116.11_26.13.04.19
CURRENT: slimbean 4.3 & carbon 4.3
keep bouncing between Nandroid backups
Super Mod GAPPS (just means I deleted apk's)
True S-OFF / Radio Unlocked