That bike as set up looks too small to me. I'd try a longer stem with perhaps less rise. I am not sure what fork rake has to do with it (?). Things like twitchiness don't really have a whole lot to do with head angle alone, or rake alone. It is the combination of fork rake and head angle (= "trail") that determines how the front end of a bike handles. How much weight (percentage wise) you have over the front end of the bike also affects the whole front end handling scenario. I am only speaking from the perspective of the image: you look too scrunched up to me, and that can be (at least partially) remedied by going with a longer stem.

Also, don't lock your elbows!!!!