My electrics weigh almost exactly the same as the trakpower 4900. I run the lipo as far forward a possible and use 2 x 5g to seperate the lipo from the prop and 1 to keep the speedo away on the other side. I run 20g under the front shocks generally (but tune this depending on the track). Total weight comes out at about 1615g.
I posted a pic of my layout in the other thread which has the speedo up front and the servo layed down. I did this as it spreads the heavier items out on the electrics side and moves the weight slightly more forward.
I've played with ballast a fair amount but found this the best distribution so far.
Hope that helps, if you want any pictures let me know.
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