I'm no expert for sure on head speeds governor or not, the critical factors though I know as Tony and Steve talk about is 1. Motor bogging, and motor over speed. Neither of those are friends of flights.
As Tony and others have said its best to use one of the esc's that are known to have a good governor setup, instead of the ones the FBL units provide. I know the gov setup on the AR7200BX is said to be decent....for the fuel heli's, as well the Ikon as Tony stated. As well Steve and a few others I have heard recommend or have experience running gov with different esc's and also know through experience how their heli's have performed with different esc's. So I trust their words on it. I know just from listening and trying the Hobby Wing Platinum Pro series esc's provide an excellent regulated governor and head speed on my heli's. They fly so much more smoother and predictable. The head speed of any heli and ability to do mild to wild 3D of course depends on blade pitch setup's (-12 to +12 or more) and head speed of the given motor. I've seen guys with very low head speed doing 3D (abet a slower version of 3D) but doing most of the manuvers still.
I'd reckon if your caculated head speed is reaching too far with your pinion combination, then that would be the change that's needed to get you within your target safe speed, either 1 up or down possibly 2 either way. I have a pretty dependable app on my phone that caculates your head speed by sound. All you do is hover the heli at your given flight mode, idol 0 1 or 2 and it caculates and gives you a reading of your head speed. Works pretty good! It's called helitach. From my understanding of motor/ESC combinations and 3D whatever the head speed is lower or higher, when say you flip one upside down its not really the head speed so much as the blade pitch, and power of the motor under loads and ability of whatever ESC to continually deliver that same power as well the motor to continue rotating at said RPM. If the motor/ESC combination is weak in one area or the other then you'll bog it, loosing power loosing RPM, and if said ESC is not powerful enough it won't provide the needed juice to the motor. It's like having a big block motor built with all the muscle it can be and then putting a 2 barrel carberator on it, then trying to stomp the gas! That engine will bog demanding more fuel!
By not having the correct head speed it's like taking a car past red line.
On the heli it's going to again demand too much from the motor ESC more than likely heat things up very hot, and your motor or ESC will fail.
So it sounds like your going to have to either back your throttle curves down a bit or re pinion it to which ever pinion will lower your head speed. The governor itself isn't going to remedy that situation, it's only going to regulate RPM's in the parameter of RPM's it's given....if those are too high, the governor doesn't care, it only goes by what you provide in the RPM range. If it's too high, it'll just run in the over speed area a the set RPM's you provide with throttle curves or motor pinion choices...
Can I have change 
