This is my exact build except I only go with 1 point in Pain as the damage increases with each skillpoint is minimal. I agree with Gigabits that the 616 is a must for any engineer so I have that. The only other difference is that my Wither is maxxed at 6 along with Decay. I only put 3 in Leech. It doesn't seem very effective to me and it's an effect that can easily be replaced by a stim if needed. My build is all about how effective I can be for the group. It's not about efficiency as efficiency doesn't directly help the group as much as it helps the self. It takes 6 points to get Protection up to where it gives +50 armor or 1 pt damage reduction. I'd rather use the points elsewhere. In regards to force shield, I don't any points there because it only gives one point regen. Placing 4 points would give. 2 regen but those effects are easily replaced by a sip of the power stim. Hence I do not spend any points on any regen and maximize my effectiveness by investing in damage skills.