"the Delphi is a great turntable and the ET2 is a great tonearm, but together, they aren’t the best match."
After reading the OP’s setup, I wondered about that setup.
In the 1986 review, the ET was thought to be ideal. From the review:
The SOTA, VPI, and Delphi also work synergistically with the new air-bearing arms. The Eminent Technology Two, for example, provided outstanding performance with all three turntables (there is a special mounting kit for the Oracle). In fact, I’d urge you to audition this combination. I’ve not had the opportunity to test the new SME V or the latest Goldmund arms in my system, but the few people I know who’ve experimented have all felt the Eminent Technology to be at least as good, and $700 to $2200 cheaper
Oracle Delphi turntable | Stereophile.com
VPI Dragon- it looks like it will be a decent table, but $8K? I’d look at what other brands/setups $8K can buy.
Few bucks less gets you fully loaded VPI Classic or a little more(MD has B stock for $12K) HW40 DD.
If it must be USA-SOTA