I can my car perfectly balanced at around 1480g. At my recent state titles (weight limit 1500) i was using a ko 2413, KO speedie, Spektrum micro receiver, lrp 10.5 with the fan and heatsink(Weighs 40g).
and amb. On the other side i was using the manutech lipo tray. But it has been milled out by a machinest and now weighs 63g. With a Ip5000 30c lipo (279g).
Also had 20g in the centre of the car. 10g on the FL, FR and RR corners of the car. Body weighed 112g.
The car was really good and perfectly balaned side to side.
Was also using 38t pulys, ashphalt top deck, ALU shocks, and a hard foam bumper(ALOT Heavier than standard). So slightly different weights there.
Hope that gives some ideas,