Have you checked if you have the right pistons in the rear and front shock's? in the manual it says to put the 1.3 in the front shock but they should be in the rear shock's, and 1.2 on the front shock's.
Hope this will sort it...... Did for me
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Kyosho Lazer Zx5 Fs2 Sp WE
Kyosho Tf-5 Shin
Kyosho Rb5 Vega Edition Gen 2
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Bergen-Norway