Robotic cleaner AND a floor cleaner system?

I have a 50000 gal IG gunite pool with a built in floor cleaner system. The pool has an automatic cover, but it still gets debris in it - we are in the forest. I find that the in floor system doesn't do a very good job, especially since I got DE powder in the pool ;( I just can't get all the DE powder out - I let it sediment out and vacuum it up but the next day it is back. The in floor system just seems to kick up the powder. SO - I am considering a robotic pool cleaner, mainly for the 2micron added filtration but the overall pool cleaning. Any comments or suggestions?

The pool has a DE filter which I have backwashed thoroughly and recharged, but still won't eliminate the powder. I haven't taken the filter apart to look for tears, but I don't think there are any. The DE powder got in the pool from a mis-positioned valve during a recharge. The water is crystal clear after a number of hours with the floor system off. The chemistry is good and has been stable. Any ideas?

50000gal IG gunite pool with pebbletech, DE filter, in floor cleaner, salt, jandy controls.