Hooray! Someone else is working on this! I swear that I've begun thinking the CPP2 is being treated as a pariah by both former CPx fliers and by the company that released it!

Just wanted to respond to your comments, quickly.
I offered no inverted flight recommendations (i.e. no data on ST1 and ST2 settings). I did create them as you suggest but I'm just not doing inverted yet so that has been less of an issue. I'm fiddling a little with Dual Rate settings for Aileron and Elevator (putting in some exponential - around 40%) but so far I just like linear. It is too windy here in Denver to fly just yet so this is all garage hovering observation.
Yes, you are right that the stock Tx sets pitch for Normal mode to begin positive at 50% stick. However, I've been trying to work around some limitations. For one, the zero in the pitch curve implies zero pitch. Hence, the adjustments don't start at -2% below 50% stick. One of the things I've been doing is to try to get the pitch adjustments such that there is a minor negative value at zero pitch, so I can throttle up higher without lifting off. Hence the +2 at 50% stick is really (I hope) the equivalent of zero measured pitch on the blades (I've been using a pitch guage to dial this in). If I start doing inverted flight, then I might have to add some pitch to the servo (not sure yet) and readjust. I've played a little with ST1 and note that at 1/2 stick, it is definitely at a higher throttle and pitch setting than the NORM mode, which is not what the graphs would imply.
As to throttle. If you'll note the CPP2 manual (Page 40), the Throttle settings really aren't linear for the NORM mode. First quarter of a stick goes up to 45% throttle. At half a stick, throttle is about 65%. 3/4 stick is 75% and fully stick is 100. I've been starting from that diagram and putting little adjustments into it to suite my habits. First, I keep throttle a little lower at 1/4 stick because this is the area I'm letting the blades and flybar get settled. Second, I like a little higher throttle at half stick so I get a little more stability at lift-off pitches. Also, I'm noticing that the ratings of power are not quite exact so I tweaked a little higher. It is not a recommendation but since I don't think I have a dual rate for throttle then I cut myself a little slack there. Also, trim on throttle would be an option to increase power. I haven't yet gotten comfortable with these trim adjusters yet. Once I do, I'll probably tune it back down to normal.

Glad you're making progress on this as well. Once you get the exact settings as the stock Tx, let me know if it flies the same and I'd like to see what you come up with. We seem to be 'bleeding edge' on this one. This is my first CP Heli and my first one purchased in its initial release. I'm surprised at how little support there is on it if it is even a little different from the old CP's.

BTW, have you had to replace a tail rotor blade yet? They won't have stock parts until June, I'm told, so be careful with the tail motor. Until I get real tail rotor blades, my GYRO is not holding as much as I would have liked. I plugged in the yellow plug into GEAR to test the DX7's ability to control the GYRO but took it off when I started having other problems. I'll try again later.