I bought what looked to me like a decent rage slave, and for the first week or so he did very well (greater than 90% win ratio). More recently, however, he has been losing more often than not and can't do much in the pit fights either. He is using two handed weapons right now.

Here are his attributes:
Strength
92
Intellect
81
Agility
70
Stamina
74
Size
82
Presence
70
Chi
80

Skills:

two handed weapons 9
devastating power 5
grim determination 2
sunder armor 4
brute force 2

Fight strategy:

Start: 9 berserk 9
Very tired: 3 kill shot 3
More endurance: 8 berserk 8
Moderately tired: 4 slash 4

Any tips? I have played around with raising and lowering activity and bloodlust, but it hasn't done much.