Does anybody know how to improve E4RS' shocks? I found the shocks don't bounce back to half and move quite slow (higher friction?) compared with my E4JS' shocks and Tamiya TRF shocks. They all have two holes piston and TM #300 shock oil in them, E4RS' shocks just seem to be stuck at 1/3 way. Is there any way to improve? Or any other brand you would like to recommend?