Sokkos is so much better than the stock firmware! I would keep it if I were you.. (I have it on both my x0xb0xes)
I've not noticed the bug you mentioned?
The only bug Sokkos has that I am aware of, is the action of the R-S-A functions occasionally sticking when used on the fly. But it really doesn't happen too often at all.
But if you want to downgrade, you can do it in the normal ways that are documented here 'n there on the forums etc.
And yes, it's normal for the USB connection to be crappy, but persevere, it always works after a few tries for me.
It's been a while since I changed firmware on mine, but I seem to recall that uploading firmware would often work, even if it claimed there wasn't a connection. I think I kept hammering on 'upload' (or whatever it is called) until it worked.