So I guess I shouldn't go Tanks on a map where I can't go around Ronins and Warriors or pound them from different angles.
Tremor feels like the best counter but then I might aswell facswitch into Firewalkers or Thunderbirds.

Grizzly isn't particularly effective against Rockos since they are so cheap and there isn't much stopping Rockos from just advancing against Grizzlies and Panthers I'd say.

when ht against bots i would go for minotaur, because it can tank many shots and has enough range to reach the rockos.

Tremor may be effective, but very vulnerable (1 sniper something can be enough)
and it costs to much

It might have enough range to reach rockos but it is not likely to hit rockos at max range. Also warriors hurt a lot if you are just trying to chase them down.