A few things to try to improve the dust capturing ability of your saw:

Improve the airflow through your DC piping, run a 6″ line to the saw and get rid of the 4″ port fitting on the saw.

There is usually a wide gap between the top of the saw cabinet and the underside of the table, fill this in with strips of foam.

Close off the semicircular gap in the front of the saw where the height adjuster comes through. You can use the magnetic sheet material meant for signs on car and truck doors which can be removed if you need to tilt the blade.

Seal up any other gaps in the cabinet that waste the airflow around the blade.

Try using a zero clearance insert if you don’t use one already.

Line up the saw blade to be exactly parallel with the fence. If the saw blade is rubbing against the sides of the cut in the stock at the back of the blade it will shave off fine dust and throw it upward.

If all of this still fails to capture adequate amounts of the dust then try an aftermarket blade guard with a dust pick up built in. It would be very difficult to add a dust shroud around the blade inside of the cabinet.

John White