My stats when reaching the citadel and switching full time to a crossbow (required strength 12);

level: 7
strength: 14
agility: 10
constitution: 5
intelligence: 1
survival: 6
speed: 4

The end of act 1 and beginning of act 2 I was boosting my strength for equipment requirements (found another crossbow that needed 17, and a pair of leggings with a 19 requirement). The second half of act 2 I concentrated on the stats I had been neglecting. Once I got the crossbow skill, I put 5 points into Reload Time (made up for low speed) and 2 into Accuracy.