I am interested in how you overwhelmed your opponent in summoning with HoS? I have just started with the army and have played one meeting engagement against DoK. (SH: HQ, 5 Lifetakers, 5 Blood Sisters; MB: 20 WE, HQ, Medusa; RG: 5 Blood Sisters and 5 Lifetakers). My admittedly very experimental list (Masque and ES) was going for speed. (SH: 5 Seekers, Masque; MB: KoS, 10 Hellstriders; RG: 5 Seekers, Mesmerizing Mirror). I lead by 1 point end 3rd round but he managed to 1 shot my KoS with 20 WE - I failed to LoD with a 1 - that turn. Turn 4 was possible to hold on, but needed some luck.
Any way, I have been theory crafting a good HoS list and I don't think summoning is going to be such a big factor given that you also need to hold objectives and going hero heavy doesn't help in that regard. I mean, I am pretty sure I will replace the Masque and Mirror, but most other hero options are going to give me 1 more hero. Of course I can cut down on seekers but they are kinda good for speed and holding objectives (okay - I just like playing them). How did your "summoning overwhelm" list look like?
I have played a couple of games with my DoK, I haven't bothered with Morathi (not my style - maybe for tourney), but I also think regardless DoK are good in this format just with 20 WE and a HQ in the main contingent, nevermind if you follow that up again in your rearguard. I can see your issues with Morathi, but I am also curious if it is really that bad, given different scenarios where she might come in late and/or if she is effectively screened. I played games with both my HoS and NH where the speed / early objective grabbing was almost enough to hang on if it wasn't for some bad luck / mistakes. What was the rest of the Morathi list?
I am not so negative about this format and actually very excited for it...but we probably need more games and a bit of a meta to judge just how much of an improvement it is on 1000pt standard games. Until then we need to hear all the experiences and there is always the local group / meta factor that might also play a role in how viable the format is in the area.