Tanks seem like a nice unit in ones head, but looking at the stats they're not that useful I think.
Besides that, more cavalry simply hinders you from more artillery. They practically render the dig-in boni of the enemy useless. Husars are quite nice in early - mid since they give recon values. It sucks and is standing - I usually go (besides very early) for almost only standing artillery, mobilize, then attach the mobilized infantry stacks to the prepared arty ones and off they go. Late - 15 Infantry, 12 Artillery, 1 Airplane (well, I only play with a mod that nerfs airplanes since they're just stupid). Mid - 10 Infantry, 8 Artillery, 1 Husar, 1 Engi Early - 6 Infantry, 5 Artillery, 1 Husar (36)