My display has a 10 point gamma adjustment and a cms that works well, but I prefer to let the ee color box sort that out. Colour space target is rec709, gamma that I use is power law. Brightness and contrast is pretty good out of the box, contrast can be toned down a bit. I am using Ted's light space cms disk for patterns, also have spears and munsell hd benchmark second edition, I just use the spears for reference.
Okay, if you set the white balance to d65/rec709 with the colour temp set to warm 1, and then change it to warm 2, if your meter is accurate for d65 you will have an accurate d55 at warm 2. If not, set warm 2 to d55 accurately, change the colour temp to warm 1, measure/capture the colour space in the colour space editor of calman, save it. Now you can calibrate warm 2 at d65/rec709 using the colour space you have just captured, just leave the chromaticity coordinates as rec709/srgb. The i1display pro is more accurate at d55. Actually the i1pro2's ref tile coordinates is x=0.33333 y=0.33333 this amounts to a temp of close to 5500k. I have tested this, by setting d65 with the pro2 and then checking the colour temp with the display pro and they do not agree at d65. When done at 5500k the agreement is a lot closer, only that the display pro over reads (not enough) blue by a small amount, about one click.
What technology display are you using, what meter mode do you use? The above mentioned method is true for the plasma meter mode as my display is plasma. I have tried all the different modes available for it, and the plasma proves to be the most accurate for my display.