I think you'll enjoy the KK2. As I said, you can play with the settings at the field and get instant feed back what stuff does and doesn't do. I would highly suggest the KK2 mini. It does the same as the older big one, but shaves off 60% of the weight.
But the caveat is, you DO need to update the firmware, or you will definitely be flying with outdated 18 month to 2 year old inferior code. I can't recommend
Steveis' firmware enough, and you should at least start with
V1.17S1 as a minimum. Of course, that means purchasing the update tool as well.
If you do decide to experiment with settings, make sure you write down the settings that are at least working "ok", so if you mess around too much and get confused, you can return to a baseline.