I normally drive with around 60% dual rate (however my EPA's are both turned up to 150% and then adjsuted from there, so its probably more dual rate in actuality than 60). I have an m8 radio btw...

As far as feeling ultra twitchy, it could be you might want to run more mechanical grip than steering throw, or maybe the otherway around. What car and whats the set up? since its hard to make suggestions otherwise.