Nice necro!
You would think gravity would speed you up as you approached a planet, right?
It's 'gravity' ED style. The slow-down is annoying but I suppose it avoids even more annoying over-shooting.
This always has me flummoxed, to pick an extreme example I'll use Hutton orbital, you continue accelerate until the halfway point .11ly then it starts to auto decelerate even though still at max throttle, I know full well I can slow down to 30km/s in a very short time from the max, so why the deceleration over .11ly ?