Hmmm....I found that the Jolida solved a lot of the thinness I was experiencing w/ my Xpression and DL-110.
How are you loading the DL-110? I found in my system the Denon sounded a lot better at 1k - definitely more mid-bass and a beefier sound.
I picked up the Jolida used and it has a pair of RCA 12ax7s in place of the stock tubes, so I'm not sure what effect that may have had. I've heard the Mullard reissues are where it's at, so after the holidays I'm going to get a pair and play around a bit more.
And lastly - I recently picked up a gently used Ortofon 2M Blue to compare/contrast w/ the 110 and at first I didn't like it as much as the Denon - the sound was once again a bit think and missing mid-bass. But now that it's broken in a bit I think it sounds heavier and fuller on the bottom-end, so I might be sticking with that instead of the Denon. Not saying your 110 isn't a good match though - seems I've read quite a few people enjoying the pairing.
And here's a thread on your tube question:http://audiokarma.org/forums/showthread.php?t=351420