Definitely try the red/blue with 50/45 oil in them. It would also help if you mount the shocks on the forward part of the tower in the front and aft end of the tower for the rear.
Castle Neu 1520 on 6S LiPo Powered Gmaxx (Nitro Killer)
Predator with OS .21TM
Supermaxx with Mach .26
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Ofna CR with Tekin ESC/Motor (2)
Definitely try the red/blue with 50/45 oil in them. It would also help if you mount the shocks on the forward part of the tower in the front and aft end of the tower for the rear.
They work much better Lito, thanks for the tips. I swapped out the white springs for Red/Blue and added 50wt / 45wt. A lot better rebound and have some nice action now. Plus I moved them out like you said.