Hi Mark,
I´m sorry for  my late reply.. too much work these days.

Regarding the smoke; I normally cruise at Mach 0,8-0,83, being around 85-90% N2. If I throttle back till the smoke disappears which is below 75% N2, it slows down below Mach 0,65 and the pitch increases more than I like.. But no White smoke at all.

Regarding the jumping plane on the tarmac; Only the CS 707 does so, neither CS 737, default Cessna nor any other Aircraft behaves like that.

BR,
Anders