Hello,
the tornado is not a super powerful boat in it's original configuration. it's efficient. it was designed for sailing in the north sea.-high winds- at the old 235 sq.ft. of sail area it has much less sail area than similar boats from recent times.
Also it is ten feet wide so there is greater righting moment. also it was designed as a single trap boat.
from my experience of solo sailing in strong winds, i would advise a roller furling jib. then you don't need to convert to the self tacking model, and the boat should sail fine on a solo as a unirig. i started sailing tornados in '68 so i do have some knowledge on this subject.