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Regarding smoothing, for importing it via FBX into Maya, you should have this checkbox enabled (in Maya 2009, it's called something slightly different).![]()
And can you provide your model with all 34k polygons? I’ll try to export it into the game.
I tried, but unfortunately, it didn't work.

I can send it. But what do you prefer? A blend file that includes both high-poly and low-poly versions with textures (and they are 4K), or just an FBX of the high-poly version? Or maybe just the low-poly version; there is a texture for it (1024x1024).