1st question: I am doesn't using droidwall. Guys from 4pda.ru asked to me add suppurt iptables in this kernel. My recomendation - if you has cheap or unlimited Internet - you do not need this app
2nd question: It's doesn't work?? If it is, then PM me - i am do not use ext3/ext4 - what meaning on it?
3rd question: What so small freq? Try to squeeze more from your device - by example 600. !!It's no recomendation!! If you damage yours phone, don't write to me . With Onyx ROM my cpu works on 245-710 without problems. As solution, recomends you in NofrillsCPU settings turn off emergency stop(something like that - my native language is Russian)
Forever with community. Thanks to all