I use 10's on mine and I hear no disernable difference
When I played a DGT, I also heard no discernible difference. But, personally, I think the DGT is a "Whole Package" - the 11's made it feel more like a player, made it feel better to me, against the larger frets and those amazing pickups.
Speaking of the whole package, the DG30 amp is also phenomenal.
I have gone back in forth a few times with string gauge to see the difference and IMHO .011s on the DGT is a critical part of its overall DNA. When going to .010s I did not get the bloom, girth or complexity that I hear from the .011s. Just like anything else it is a culmination of many little things that make up this thing we love. Also, my DGT is 7.5lbs and to my ears much more open than many others I played that were in the 8 - 9lbs range. YMMV.