The 250.8 is way more power than I need and I'm tempted to try swapping it out for the X30.8. I don't think you would need the 250.8 with D7s.
Another interesting option is the Benchmark AHB2. I'm trying one out for fun and I really like it! I don't find it offers the 3d presentation of the my Pass and offers a thinner sound, but boy is it clean and life-like in its own way. It's like a window was cleaned to the sound. I don't find it analytical or forward with my D9s at all and could certainly live with it long term. It is punchy and fast too; for $3K I'm a big fan. I'm using a SimAudio 740P pre and Mojo Audio Mystique v3 R2R DAC so no tubes but nothing too bright or forward in the signal path either. I did try the Benchmark with an RME ADI 2 FS as well, but still didn't find the sound too bright for the Spendors...
Good Luck with your search; that is one of the many pluses with the D series as they mate well with many reasonably priced amps!