G27 Clutch sensitivity for TDU

[HeLeX]

I have a G27, and I transformed the Ferrari F430 into a manual using TDU PE 2.77 so I can use the H-shifter. Everytime I press the clutch down full, I notice that the rev's unrealistically drop from say 8k straight to like 3k in less than half a second. In a real car, when applying the clutch the rev's only drop at a slow rate. This isn't the case with TDU and the Ferrari F430. Using TDU PE 2.77 can I somehow adjust this? Like changing inertia of the gearbox, engine or torque rpm???