I don't use work the ball into the box option and I regularly have 70+% of possession.
I mostly use a balanced or cautious approach with shorter passing and the standard tempo those mentalities offer.
You could try removing the pass into space option and drop your mentality a notch to balanced. Your player roles look good, similar to what i use.
Positive mentality for my team seems to lose us possession a bit over balanced or cautious. I go positive when I'm really looking for a goal, my primary aim is retaining possession and working the ball around waiting for an opening.