I guess that the question is, "Is there any Dust Collection Syster That Will Pull All Of The Saw Dust Out Of The Csbinet Of A Table SAW, Or AT LEAST MOST OF IT" ?
Sure there are. But it'll cost you probably a lot more than the saw you're trying to keep clean. Entry level: Oneida Air Systems Pro 1500
The problem isn't your collection system, it's that almost all saws aren't designed for efficient dust collection. The typical approach is the same today as it was 60 years ago, let it fall to the bottom for someone to clean out. Improvements since then have pretty much consisted of welding a port for a 4" hose somewhere near the bottom of the saw in the hope that the customer will have a DC system big enough to pull enough air through the small spaces left open in the saw cabinet to suck the pile up(never mind that such a system would draw more power and cost more than 2-4 of the saws themselves). Now they can advertise that their saw has "built-in dust collection" and sell it to you for a much higher price than it cost them to weld on the port that doesn't do anything but make you feel better about spending the extra money.
Call me a cynic, I'm used to it.
If you can, try setting up a partition in the saw below the mechanicals with a dust port in the center that you can connect to. Don't let that dust fall down to the floor, catch it while it's still airborne. Cut some holes in the side of the cabinet so you can get airflow(you can't pull more air out than can come in) to the collector.
Personal experience: I had a Bosch portable saw(4100) mounted on a custom cabinet with a compartment under the saw and a 4" port at the rear. The Bosch has a "dust collection shroud" around the blade with a 2-1/2" outlet. I ran the same Rockler DC you have on the 4" port, a Festool vac on the 2-1/2 port and the cabinet would still fill up with dust in a few shop sessions.
I replaced it with a Sawstop contractor saw not long ago, hooked up their shroud to the DustRight collector and haven't paid any attention to it since. Haven't had it long but I've used it to rip up the material for a workbench, a tool cabinet for below the bench and a couple of miscellaneous small jobs. Your post made me curious so I just went out to check on how much sawdust had accumulated below the saw. Here's a photo:
Now that may seem like a lot of accumulation to you but here's what I made with that byproduct:
The pine for the bench was planed to 3" for the legs and 2-1/4 for the stretchers, stock was 10" wide. The maple was planed to 1-3/4" and ripped from 8" stock. The birch ply for the cabinet was ripped and crosscut on the saw. That's a fair amount of ripping in my book.... Oh, forgot to mention, the dados in the ply were cut on the saw too.
All with the very same dust collector you're using with the add-on 5-micron bag.
So maybe you should work on your saw...