I'm using a JR 8103 and had to reverse a couple of channels myself. There is nothing wrong with having to reverse a channel. It all depends on what side of a control that the servo is mounted. If the collective servo were moved behind the main shaft, then it would not need to be reversed. Make sense?
As for pitch settings, they are mostly done in the radio. With your pitch curve set at 0-25-50-100, set you high and low end point (travel limits) so that you have full collective travel in both directs with no excessive travel that will bind the servo. After you set the end point to max travel, adjust your pitch curve so that you get the pitch range you want. There is not a magic set of numbers, they will vary from heli to heli. Make sure that at mid stick you have zero pitch. The midstick number is the 3 or middle number. As for the two numbers above and below midstick, adjust the outter number so that you get the total pitch you want, and average the 2nd and 4th number so that it creates a linear line between the number above and below.
These are only examples, not the final anwser in your situation:
Hovering pitch curve with very little negative and about 7 degress postive: 40-45-50-65-80. These curves will work with a throttle curve like 0-25-50-75-100 in normal mode.
3D pitch curve with equal postive and negative pitch of about 7 degrees: 80-65-50-65-80. The throttle curve for fixxed throttle mode would be something like 100-90-80-90-100 in idle up 1.
THESE ARE NOT the exact setting you will need by any means! They all vary, I'm just trying to help you picture how they work.
Don't come off the throttle untill you see your GOD!