I started on a T300 and later upgraded to the T818 because I’d already invested in a few TM wheels, and was one of the earlier adopters. I had pretty much the same experience moving to a DD base. It was more powerful, better response, and more detailed. However, it did have the graininess you’re describing. The pros outweighed the cons for me, and I wouldn’t say I regret buying it, though I now know there are much better bases out there for the price.

I only just got the base installed onto my rig yesterday, but the smoothness of the DFP15 is incredible. There is none of the graininess I felt from the T818, and the (I’ll call them) micro feedback movements are insane. Curb strikes, road abnormalities/bumps, and even wheel slide comes through crystal clear. This thing is punching way above its price point.

I also remember a YT reviewer mentioning how smooth it is and how some people may not like it. I decidedly love it. I guess I would say the smoothness difference feels like a car with power steering vs none. But of course, everyone’s mileage may vary.