The KV-8 is great if it can be rushed, which in this doctrine means that you plant a few less mines or use less mortar flares/sniper flares penal ptrs or Zis-3 barrages and instead try to play a heavy soviet t2 or apply lots of pressure with a t1 and then invest in a cache or doubletech to t2 and then skip t3 and get t4 with a kv8 as first unit.
After the KV-8 you could get a t34 as soft AT to support your penals, Zis guns or a SU-85/SU-76 (later, the 76 variant only vs p4 spam if the enemy might get critical breakthroughs otherwise)
The KV-2 might be useful if you have your Setup ready and can hold off axis advances but you want to start soften their defenses (often great if you lost the KV-8 which could directly engage AT-guns).
The KV-2 comes way later and isn't as effective against teamweapons in a direct matter, but can engage them from a safe distance and usually needs to be countered by p5s or and elefant as it combines a t34 and katy it can hold off medium tank pushes easily and can fire over long distances.
The best part about the doctrine in teamgames are the repair stations and the combination of the kv-8 and the crew repair so you can dive with your kv-8 and repair quickly after disengaging and can keep the pressure high.
The weakness of this doctrine are early light vehicles or infantry heavy buildorders as it does neither have atgun camouflage to increase the strength and utility of t2 openings or elite infantry to quickly react on unexpected playstyles. On a sidenote this Doctrine also lacks offmaps so it might have troubles dealing with a LeFH or Pak43 you cannot help your team by providing reconnaissance and fuel drop planes can get hardcountered by a flak halftrack or 2 222s on most maps.
