I think this talent tree could simply be lumped into the base biotics of each power. With many force powers, the result of your roll determined how powerful the effect was, be it more dice of damage, longer duration, or a larger area of effect. I think that simply being able to consistantly get a result of 20-25 on a biotics check should be enough to increase the base ability. I would like to see a few talents for each group of biotics that do static pluses, like the ability to target one additional target per use of the power, or a longer range on a power, etc. It can be quite overwhelming coming up with a system by yourself, especially within such a short time frame. Keep up the good work.