If it's already settling to the floor floc won't help . . . and yes, it may make it worse.

Add DE to your filter again, but watch the water stream from the return: if it becomes cloudy, or even visible, your filter probably needs work. Dirt bypassing the filter can definitely cause problems like this.

If your filter is NOT the problem, then you need to try hand vacuuming. Leave the DE in the filter, HAND vac the pool, and then backwash.

Now the fact that you've added floc *may* mean that you've suspended some of the dirt in the pool, till the floc breaks down. However it may settle with no circulation. So, after you vacuum, raise the chlorine pretty high in the PM, and then turn the pump off overnight. If you have dust in the AM, hand vac again.

That may take care of your problem.

BTW, you can test your AquaBot with DE too. Put a small amount of DE on the pool bottom, and then guide the AquaBot over it. If DE comes out of the AquaBot's exit port . . . you may have found your culprit.

Ben