Russia was most certainly NOT the most powerful land force in the world in 1835... or for that matter, just about any time in history (I certainly can't think of a time when they were). Until post-WWII, Russia always lagged behind in both economic and military development. Just like in HOI: lots of manpower, low quality. I'm not sure which military should be the most powerful in 1835, but certainly not the Russian army. Maybe Britain, simply due to industrial advances, or France, due to experience from the Napoleonic Wars, though I don't know how much that carried over after Napoleon's defeat. Certainly by the mid to late 1800s, however, Prussia/Germany should have, if not the most powerful army in the world, then the most elite.
I think, though, that rather than use the Crimean War as evidence of the end of Russia's domination, one should instead view it as evidence of Russia's lack thereof (same goes for the other powers save Britain in that war, for that matter).