I currently own (or at least live with) four
of these: a '70-71 Professional, a '73 (?)
Competition, a '70-71 Super Course, and
a much loved and slightly abused Sports
of God only knows vintage.
I ride mostly 23"-24" frames, but the Pro
has 700c wheels, so even at 24.5" I can
just make the standover.
I have no idea how to answer your question.
So much of this is personal preference and
willingness to tweak until the thing gets
dialed in. You may discover you actually
prefer the longer TT, as did I recently.
My own feeling is that there are so many
variables in terms of frame geometry and
your own weight and weight distribution,
that any answer I might give based on what
you have posted would essentially be
meaningless. (Some of my friends might
tell you that any answer from me would be
meaningless
.)
BTW, do not discount the Super Course out
of hand simply because it's straight gauge tubing.
If you can manage the transition from cottered
to cotterless crank, it makes a very nice ride.
Respectfully,
Mike Larmer