That file was only for Alpha 2, it worked for me.
Most of the Sleep of Death bugs are " supposed" to be fixed by Alpha
3.0 (by most of the feedbacks, it was fixed). Alpha 3.5 supposedly only
touched some 3D and wifi related stuff, and no low power/wakeup
features were worked on.
To date, I haven't read too much reports of SOD on Alpha 3.5. My
personal experience on A3.5 has been pretty solid, no SOD, no wifi or
SD mount issues except for some Chinese E-reader app incompatibility.
My suggestion to you would be to uninstall all custom patches and
overclock related patches from your WEBOS, then boot into CM7 CWM,
clear cache, advanced->clear dalvik cache, re-install Alpha 3.0, test
for SOD for about 2 days, then update to Alpha 3.5 and test for SOD
again.
I also have Juice Defender installed and running on balanced, you may
want to try this as well, not sure if that's moot or not.