Maybe he's just inspired more by Metal now. DT was always a Progressive Metal band. I feel like DT's "Metal" sound changed with the times. I mean, back in WDADU days, it was still Progressive Metal, but the Metal elements were derived from what was current at the time, the riff driven nature of bands like Metallica, combined with the virtuosity and melody of bands like Van Halen.
These days, Metal is dominated (sadly) by Metalcore bands like Trivium and stuff that's a bit heavier and colder, and I think DT's style reflects that.