[Shark413]

I noticed a lot of the top truggies have moved the CG forward by strenching the chassis and/or moving the engines more towards the front. I noticed this on my Kyosho ST-RR and it is one sweet handling truggy. I think the Losi 8T also has moved the weight forward. This impacts weight transfer and front/rear bite. But to answer your question I don't know what the exact percentage would be, I would assume you wouldn't want to bias it one way or the other by much, maybe a little foreward bias to aid in weight transfer under acceleration and cornering grip when off the throttle. Just my two cents.