EDIT: I did it. Now i am back busted to10.7.1 B26 (from 10.7.2 C37) -
EDIT2: FIRST major problem: Textedit is alway crashing - look my post a few pots later.
So the downgrade to 10.7.1 may give probe, because some system content may not work with 10.7.1 (kernel or other things) and only an final 10.7.2 combo may help (or get back to dev builds C37 and later until final 10.7.2 combo).
Kernel is little smaller (1 MB less from 15 MB) , i think dev builds like Cxx always have some more debug code in and/or may not so much speed/size optimized compiled. So even "backwards" maybe little better overall.