New AMD gpu drivers are out and with so many new things I just gotta use them. So far mining speed on teamred seems to be a bit better and now one can undervolt well enough without registery powertables.. Not sure if the combination of new drivers + teamred or just teamred but whole system seems to be laggy while mining. It wasn't before

Probably need new CN-values.
Release notes
https://www.amd.com/en/support/kb/release-notes/rn-rad-win-18-12-2Download as usual.
Sapphire Pulse Vega 56 & Cryptonight V8 algo.
i can verify the lagginess with teamread and 18.12.2. drivers with my vega56/64. hashrate is higher without having to mess with powertables, but there's a substantial lag on the system now.
Can you elaborate a bit more on your setup? Are you running the cards with risers?
I just ran my Vega 64 LC on 18.12.2 and did not have any problems.
i7-5930k, one vega56 pciex16 slot with monitor connected, two vega56 on risers, one vega64 on riser... all set to 14+14, win10x64
My system is similar except for the risers, so that's something to look into.
If you have a chance, could you try to run the miner on each card individually to see if the lag issue is caused by a particular card or set of cards?