Teetering head - the vertical C of G of the Sea King was a contributory factor only in as much as it reduced the margin of safety for dynamic rollover.
Once the modelling was done it was belatedly understood that many 'wobbly' take offs in the Sea King over many years had been very close to rollover.
Other aggravating factors are crosswind, sloping ground (either nose down or lateral) and not having the AP engaged