Nope, no spitting back at all, and no smoke from exhaust, none -but can smell fuel in the air after running it so there's some there -but like you say it was never designed for strawberries and cream and Leisurely Sunday afternoons on the lawn...I agree tick over needs to be up a bit, what it likes.
When you do get the starting kick right, it's just as easy as the 500 - However 9/10 it's not right, and that decomp lever is a blessing -and I get to keep the Bowden lever to boot which I just think looks an essential part of the bike -