Weight you add around the lipo will also add a portion of it to the front %. try to add weight under the motor area, around the gearbox, etc... But try to keep it as central as possible (for example the weight to the sides of your lipo's is not the best option)
Adding weight further back, for example 20gr, will maybe be like adding 60gr under your lipo (regarding weight % on the rear wheels). I'm just guessing numbers but you get the point. Ideally the weight should not go further than the line of your driveshafts.
Also try a smaller spur so your motor will shift back, this has an even bigger effect than shifting with static weights. (motor shift of 2mm has massive effect on handling).
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