Sorry for my slow response. I am indeed in Australia attending an event. I am now traveling home, so have some time at airports. The simple answer is that both centre of gravity positions will work I am sue of that. Its just which one works best for you and your flying style is the question. I do not lie the rearward centre of gravity on my scale jets/ props/ gliders only because I dont feel as if the almost neutral elevator when inverted gives the model a scale feel. Sure it makes for less input in the rolling manoeuvres when inverted, but for me I quite like to put a healthy amount of down in. But thats just my flying style and I know others like it differently. My advice is go in the middle of the two settings if you are worried and then play with moving weights around until you reach a position that you like. There are always positives and negatives when moving the centre of gravity forward or back ( For example, moving it forward on the cougar will give a more solid and dialled in feel to the elevator control. Moving it back will make it easier to slow down and flare upon landing )
For a long time, I have been a believer that there is no set position for centre of gravity. There should be guidelines and limits ( forward and aft ) after that the pilot should always experiment until they get the plane flying how they like.
Sorry for the non definitive answer to your mail. Rest assured you will love the plane at either setting. If I can be of any help, just ask.
Regards Al