I understand, the number 1 reason tires don't stay on is because it is being run with too low of pressure, run the recommended PSI and the chances of it getting pushed off the bead are dramatically reduced. The shuddering is likely from a bit low oil "pressure" just at the moment you are wanting to move, the severity of it can vary with operating temps of the oil, as the RPM increases so does the oil pressure and the shuddering stops and the increase in pressure fully closes the clutch. The clutch and springs are plenty strong it's just second or two upon takeoff from idle or when the computer is trying to read your intentions with the throttle position on whether to engage or disengage the clutch. There is seemingly a "no mans land" where it (the electronic control module) can't decide exactly what to do, it juggles 14 reading from sensors on when and how to shift that also regulates the oil pressure via a piston directing both of the clutches on when to open or close. I may not be 100% spot on but this is the only logical explanation I can come up with on the shuddering. For what ever reason mine no longer does it at all since being repaired even on very slow take off.