Recommendations for 5k upgrade


As winter approaches more time is spent listening so I have allocated this budget for system changes and/or improvement. Planned changes are marked between brackets.

Source:
PC based music server / SB Touch (ext. power supply upgrade, maybe Bolder?) fed into Eastern Electric MiniMax DAC with Dexa opamps. Alternative source: Sony DVP 9000ES CD/SACD via optical.

Amplification:
Conrad Johnson CT-5 with 6H30DR tubes, CJ LP140 mono blocks (tube rolling planned, which 6922?)

Speaker/sub:
Dunlavy SC-IV modded, Velodyne DD-12 or REL R305 (haven't decided which one to keep)

Power Conditioning:
Audience AdeptResponse 12 with e PowerChord (AU24e PC planned, dedicated 20A lines planned with the next room renovation)

Cabling:
IC: NordOst Valkyrja throughout (maybe Valhalla, looking for alternatives with better price/performance), NordOst Silver Shadow for S/PDIF
SC: NordOst Heimdall (probably the weakest link here, upgrade to Tyr2 ? Alternatives?)
PC: NordOst Vishnu to preamp and power amps, stock PCs on other devices (waiting for the final direction for PCs, not sure to stick to the loom theory, having all PCs of the same brand)

Isolation: mostly Black Diamond Racing cones/pucks and one BDR shelf under the preamp, some Stillpoints (planning to experiment with alternatives like Aurio, Symposium, etc, under the devices, maybe some for under the speakers)

Room treatment: just acoustic panels behind the speakers, need high WAF suggestions for my 21' x 30' room which has a half sloping cathedral ceiling and an open staircase. (looking for bass traps that can blend in with the interior for the corners)

I am not unhappy with the current setup but like to have more details without being too lean/bright.

What is my weakest link?

Of course YMMV but appreciate any suggestion to take this system to the next level without a second mortgage (or divorce) and/or improve the synergy between components. TIA!
polyglot
Polyglot,

Wow! You've been busy and it sounds like you've made excellent choices. I also subscribe to the loom theory. Too bad you can't afford Nordost's flagship digital cable. I use Shunyata's Zitron Python digital and suspect the Lessloss may be similar based upon reports from others. If it is, it's an outstanding cable.
Vhiner,
I will, as mentioned, I am looking for used digitial cables up to $800. In fact, I have a Valhalla digital loaner, see which one comes close to it. Which other digital cable did you compare before settling on the Zitron Python? In my HT I have Shunyata power cords but am not, certainly after the recent splurge, contemplating about completing the all cables Shunyata loom there.

Back to the main 2 channel setup, just replaced the Heimdall speaker cable with Audience AU24e: less grain, better presentation, more harmonic depth. Will wait till I have settled on the power cords before deciding which SC is to stay, too many variables now but the system is trending towards Audience, taking ground from NordOst. It all started after the arrival of the AudienceResponse.
Polyglot,

I used the Harmonic Tech Platinum digital, Kimberly Illuminati and a 2011 version of Moray James' digital cable. The Moray James cable (designed in Canada) is my back up...coming in a close second to the Shunyata. I'd certainly never suggest you change your loom, but I think digital cables are a unique animal and it's certainly worth experimenting as you are.