Yes, the head has to be setup perfect. The gyro with v2.1 installed expects you to have 8º of elevator and aileron pitch that way it knows exactly how many degrees it's moving the blades when it corrects. If you have more pitch than that, then it will do what you had going on.
I don't know if the DFC head is any easier to setup. There are still two linkages going to the grips and the 3 swash links, but it does remove the swash driver and turns the linkages into drivers. Everything is the same, and I will bet the DFC head actually weighs more than the standard FBL head. Either way, they look better and as we all know, that is what matters lmao.
As for idle up, I understand what you are saying about cutting the throttle. First and foremost, STOP DOING THAT! Chopping the throttle on a plane is fine, you do it on a heli and it will fall out of the sky. Get your self used to flipping that hold switch with your right finger. No matter what, hit hold if you are in trouble and try to use the auto rotation to bring it down safely.
Start out like this. Lee had this in another thread and even though I don't use it and can't stand it, it may work for you to bring you into the IU world. Set your throttle to 0 40 80 80 80. This will keep the throttle at 80% when you are in a hover or flying. However if you do something like that flip that you did, it will start to cut the throttle. But this will get you used to the higher head speeds.
After a few flights (like 3, no more), set IU1 to 80 80 70 80 80 and IU2 (I think you have a DX8...) to 100 100 95 100 100. If you have teh DX7 (Im tired and just got to work, can't remember) then set it to the IU1 setting stated and move up to the IU2 setting after about 5 flights or so.
Once you get to that point, you will be doing so much better with a stable head speed. If you watch the flight video I did, when I was in normal mode and did a pitch pump, the tail blew out 90º on me. When I was in IU1 or 2, and I did a 100% pitch pump, the tail just shrugged it off like it was nothing.
Trust us, you will get much better if you do this. It's still just like normal flying so don't let it intimidate you. You are in control of this heli, it's not the other way around. If you feel you absolutely have to, then set your pitch settings in IU1 to the same as normal mode with the throttle settings as I posted above (80 80 70 80 80). This will only give you 2º of negative pitch approximately at full negative.
Let us know how we can help further bro. you are doing great
