The restrictor is there to place a similar orifice on each side of the valve to give it some linearity across the entire injection range. If running from a low IDC setting, you may see a hump in the injection curve in the middle IDC region without a restrictor. Depending on how you run the system, triggering it at the point you are, you may not encounter this issue. In reality, it just runs a bit fatter in the midrange, unless you are already seriously rich, it won't hurt at all.