Once you bring in that rail pressure a little faster, you should notice it smooth out a bit and your smoke should taper off.
I'm not talking a huge ramp here either. I'm talking 2 - 4k psi between 1000 - 2000 RPM.
Your idle RPM rail pressure should be around 6800 - 7200, don't mess with that. Once you put it in gear it should come up to around 8500 - 9000.