On my CFR 450r I have OEM shocks and springs while Mt dad's CRF 250r has titanium springs on built OEM shocks. and My CRF has more traction in mud and slick surfaces while the 250 spins and falls over. I always chalked this up to the different spring materials. I could be wrong and I'm not sure what material the springs of Elka shocks are, but Its worth a look.

Could also look into the adjustment of the shock itself. Also body positioning could help as well.