Now you need. New brakes and a canecreek angleset, cause the stock head angle on these bikes sucks for downhill at 66° its more like a freeride. (Which is actually what they marketed this bike as being)
well currently my dh300 is at 64 and thats a big improvement. so i think the best you can do with a angleset is about 65 or 64.5 also by pulling your fox 40 down a little bit, that will slacken the head angle slightly
You could try a Vivid on the session they aren't expensive,my bikes rear suspension is the best i felt since 6 years i have the bike.Dreamy shock but the DHX is good enought for you're bike.