I've been using the big bores on my X-6 for a few weeks now. I ended up using the white pistons front & rear with 27.5wt in the front and 30wt in the rear (Losi oil). Springs are orange front & rear as well. I agree, the orange springs are still a little too stiff for the front and the length of them makes it hard to get the correct ride height without having play in the spring & cup. Thanks for the tip on the losi springs. I'll give them a try this week.
Anyone know what springs are on this car? Pic taken from
http://koyaziano.exblog.jp/