I really like this list, and I agree it seems on the cutting edge of competitive for our sorry souls this edition..But I very rarely play at 1750. Usually just 1850 or 1500. As such I have been thinking about how you would squeeze or expand this core list.
To 1850, If you lose 2 scorpions, drop SS from the Guardian WS, and the HFs from the Prisms, you can squeeze in 6 dragons w/ DBF in a WS w/ TL SC & SS. Of course losing two members of your combat squad is a little rough, but as Rage put it, the effectiveness of the squad usually peaks at 8..Besides, adding in 5 meltas and a heavy flamer seems pretty worth it for me...
Now, squeezing down to 1500 - this seems a much more ambitious transition, as pretty much all of the fat has been cut from the 1750pt list, and 250pts is not an easy subtraction. One of the only things I can think of is to reduce Eldrad to a normal Fortune/Doom seer, and Yriel to a normal PW autarch.. =/ and then lose the same things as mentioned above I guess... But with so many losses, would you still play this list? I feel like at that point you could potentially just construct a more effective list for 1500pts...
Ibushi