RC8T center diff oil Q`s for non-racing

[Ola]

Well, i got a RC8T FT CE + tekno v4 ordered, and i want to make it as good as possible when mounting it together.

I`m going to run it on a 1520 1600kv / MMM esc, on Turnigy 5s 5000mah 30C.
Most likely just on motor brakes, but maybe even mech.brakes later.
I also ordered a 7955tg servo, alu rear hubs, and plastic spurs for it.

My problem is that i have no experience on center diffs setup, other than common sense.
It comes with 7-7-7 in the box, but wouldnt this low center diff oil make the front tires ballooning all the time, making me loose alot of accelleration?
And if i change the center fluid to alot thicker, would it be necessary to go thicker on front/rear also?

I do most of my driving on sand/gravel, and there is alot of jumping and steep hills involved ;)

Right now, i`ve got 50k, 60k and 120k fluids on the shelf for other projects, but i can order other weight`s if needed.

Please share opinions, i want to learn without re-inventing the wheel again.
(and i dont think i`m a good enough driver to feel the difference on small steps of fluid weigth ). So if you guys help me into the correct ballpark, its alot easier to go from there :)