You are experiencing the problem with static flow systems.
With the exception of the reduction in pressure across the jet (water line pressure against rising boost pressure) you are essentially flowing the same amount of water no matter how much air and fuel the engine is using.
So at low rpms and loads you are flowing a lot of water into the cylinder relative to the amount of air and fuel coming in. Your engine is bogging on the excess water (don't worry not so much you will lock the motor but enough to hurt combustion).
The real solution is to upgrade to a 2d which will meter water at a better approximation relative to the amount of air and fuel being inducted into the cylinder so that you can run an approximately constant ratio of water to fuel.
However, in the short term your options are to decrease your water flow by using a smaller jet (be careful above 4k you will also be running less water per cylinder stroke than before - you will be reducing the knock suppression of the prior water injection) or set your trigger to be at a boost above the point where it is bogging down.
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