Serpent now offers a softer but extremely durable composite nylon suspension parts for the Serpent 733 called M for medium. The M parts have more less flex than the H = hard parts.
In most cases the standard nylon parts M, with more flex, will perform best. Under very high grip conditions as well as under very high temperatures the H = hard parts will perform better. As always all depends greatly on overall set-up of the Serpent 733 and driving style as well.