Because the RM11 I had (I reluntantly sold mine to fund an incoming purchase
), it originally jumped just like yours. But when I sent it in for a warranty service, whoever worked on it made some changes because when I received it back (quick service - only took 3 or 4 weeks!), the chronograph secs hand no longer jumped and was smooth as silk at start.
Your flyback starting after 2 secs is not right. The flyback should start immediately when you active the flyback button. There shouldn't be any delay of the chrono secs hand.
Cheers,
Anthony