Hippie, I'm so glad to hear your airborne. I took two other steps between the Falcon40v2 and my 600, but yeah, there is no comparing them.
60% gain on the DX8 might be kind of high. On the DX6i, HH gain runs from 50 to 100. But on the DX8, HH gain runs from 0 to +100. (Rate mode runs 0 to -100). SO 60% on DX8 is like 88% on the DX6i. But hey, if it holds without wagging then your good.
One thing I did and I'm glad, is that I decided to fly with gain at the #1 setting. But I set the gain at the #0 setting to be lower. At one point I got an awful wag. It had been hovering steady and it caught a gust of wind, but instead of handling it, the gyro went into a wag of increasing proportions. The gain was too high. But since I had a lower HH gain programmed already, I just flipped the gain switch down to 0 and it stopped immediately.
I find I have set all my dual rates and gain to the middle positions, with a lower setting below and a higher setting above. That way I can not only experiment with different settings while flying, but if I find I need to back off for some reason real fast, the cure is only a switch away.