Hmm. If you think the problem you have might be improved with fatter tires and spongy bar wrap, then I do not think you were using the word "twitchy" in the way it is usually used in cycling. I think you have a ride that is too harsh for your tastes; that is too much vibration up through the front wheel, through the fork, through the stem and bars, and into your hands.
Are my guesses right? If so, then tires can make a huge difference. Get great big ones if you can. Good bar tape will help some. So will gloves. But, if after all that it is still too harsh, you may consider switching to a non-aluminum fork. Steel perhaps, but carbon fiber will really help.
If this is the problem, then messing with the fork rake is not really the solution.
jim
__________________
Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...
--------------------------
SB forever