I don't think it is still as much of a problem as it once was. It also comes a bit later now with the new CP system.
However, I think the main problem that may be seen in it is likely caused by the old topic of German mines: Tellerminen are basically the only way that can be used to cripple it. The more widely used alternative for other tanks, Panzerfausts, get evaporated by it. The KV-8 cannot really be countered by most German AT units if it is not crippled because it either turns them into steam (Pak, Panzerschrecks) or because it has enough HP to drive away from them into the safety zone provided by other Soviet units (German T3 tanks).
Tellerminen are actually pretty good: 500 damage (2.5*Soviet mine damage, over 50% of a KV-8) will cripple basically any tank.
However, their direct (high) cost means you can cover and protect only very little space with them. The indirect cost of Ostheer also requiring lots of munitions for basically everything else further limits their use.
Them being used very sparingly in most replay is just another indicator that something is wrong with them. Of course decreasing their direct and indirect cost would also require decreasing their damage.
But that, ultimatelly, isn't a problem with the KV-8 but rather with German mines and munitions costs. So I think the KV-8 should be left alone.
