You could try taking things down a notch instruction wise, i personally when trying to create a possession oriented tactic i try to not overkill my players with too many of them.
Try to see first how the roles interact between them and ask questions about your build up and initial plan like:
How does the ball gets to your playmaker? When it reaches him, does he has options? Can he combine with the SS that should be in the half spaces? Or does he have to recycle with the DM?
The ask who is going to be your goalscorer and who is going to assist him. The WP(s) is not going to be in the position to make the last decisive pass but he is certainly help your team play and move the ball.
Them, when you find that roles are playing like you want, try using simple instructions.
My take would be to try starting with the base of what you're trying to achieve using:
Mentality: Standard/Positive; You can try both and see depending in how much risk are your players taking and if its enough or is it too much.
In Possession: Play Out of the Defense, Short Passes, Fairly Narrow; Staple Possession instructions without overkill, you can watch your games and see if you need something more but i think this is enough most of the time.
Transition: Counter-Press (If you have the players and the quality relative to the oppossition for it, if you don't you can play without it); Watch your build up and see if your players invite enough pressure or not and choose accordingly if you want to distribute to your defender/fullbacks.
Out of possession: Higher Line of Engament, Higher Defensive Line; You can try this alone with a split block but if you don't want your WP running too much, just use trigger press More Often.
I think that when you're starting to create a new tactic, less is more, because it lets you see what is going wrong and start adjusting with little nudges but with a good foundation you can analyze better what you're seeing.
If you try some of these please show us the progress.