Its rubberised cork at Worksop. I had the same trouble, an initial aggressive amount of steering then nothing mid corner and corner exit - difficult to drive smoothly compared to the similarly set up B4FT i ran last year for sure
Strangly, the high speed steering didnt seem too bad, it was the low speed turn in. As if the turning circle was twice the size it should be.
Maybe with this info someone can chip in and offer some setup tips !
