Just started out DH and i own a XC Cube Analog Disc.
Yes first time it was hard. The trail itself wasnt so extreme, but its a rocky mountain with loads of "rock gardens" in a steep radius.
For me it was hard to keep my weight properly backwards because of the length of the steering neck - too long and suitted for XC.
Today im upgrade to a 40-50mm neck with a 70cm/5 rise handlebar.
Will give it more goes and see if things get better.
If its working i plan to upgrade to a 140 variable fork for more absorption.
But my friends on DH rings they just went over the rocks not really slowing down , while me, with my very little experience i had to slow down - slowing down most times makes things very dangerous and more unstable - and pick easier lines whenever was possible.