Morning Andy,
On the last day of the 18 meter nats at Montague, a few years back, the
fire base was activated and the County required us to arrive at or
above 1000 feet. Several pilots came to me and said, "If you don't
raise the finish cylinder to 1000 feet, some guys will drive hard and
then call a rolling finish, we need a big penalty for that". So, I
raised the 1 mile cylinder to 1000 feet and announced a 10 minute
penalty for making a rolling finish. Two top pilots did exactly what
wou described and BOTH missed the cylinder! They got their rolling
finish time + 10 minutes. There was ****ing & moaning & nashing of
teeth the like of which the world has seldom seen, complete with
threats of taking their protest to a higher power.

I don't recommend the procedure you described for several reasons, but
the big one I see is; It brings back the pull-up. I would be in favor
of a rule prohibiting hard pull-ups in the cylinder. Easy to enforce,
we have your GPS trace.
JJ

I did an analysis of this and it would appear that
the minumum time solution is to dial in a finish altitude
equal to 500' minus the altitude you can gain in a
pullup from your McCready speed to minimum sink speed.
Just before the cylinder edge you pull up and hit the
bottom outside edge of the cylinder. Depending on your
McCready setting you will approach the edge of the
cylinder at somewhere between 0 feet (Mc = 6 or higher,
full ballast) and 350' (Mc = 2, dry). It's easy to
calculate that you save about 45 seconds over flying
the McCready speed to the cylinder at 500'.