I took a look at the sensor rebalance.
Some of the sensors as currently written are actually mathematically useless right now (I don't the sensor array in a specific thread).
Beyond that, I think the sensor paradigm is going in the wrong direction. Right now the lowest sensors are so cheap on mass that they are the easiest to stack, whereas the highest level sensors are extremely mass heavy. One example, for the cargo hull, the navigational sensor is the only one worth mentioning. I can get a 20 range with it, whereas the max range actually goes down with greater sensors, because they require so much mass.
I would recommend a change to the following:
1) Make the initial sensors very mass heavy, so only a few can be used. This removes the sensor boat concept on turn 1 (if that is you plan). Sensors are for scouts at the onset.
2) Future sensors receive cost and mass decreases, but don't have a range increase automatically. This means ships can get their own small sensors more easily, but you can also combine sensors to get the bigger overall benefits.