Seeing I had such great help the first time around, I am back for some more help. I am having a little bit of an issue. When taking off on the Iris+ if I go in RTL mode during launching, it is stable and takes right off. If I enter in STD mode, and increase the throttle until it takes off. It seems like the back props are spinning at a higher rpm than the front. Which causes the Iris+ to do a nose dive. Or if I am in LTR mode (where the GPS balances out the Iris+) and I leave it alone, it tends to creep forward, until I pull back on the right stick to balance it out. Now I was going to do a "Calibrating the ESC" does that sound like what is the problem. I am very new, like my first ever quad copter. I was able to take off with the RTL at start-up, but in STD mode it just wants to nose dive. To me it really sounds like a ESC problem.
Thanks again for the fast and accurate response before.