Mary,
You are correct.
Although a boat weighting 107 kg or more in 2-up mode will never weight less then 104 when the jib and related hardware is removed. The jib sail and related hardware weight actually 2 kg or less in total when using a selftacking setup.
We knew this already at the time of writing the F16 class rules, but we wanted to make sure that a compliant F16 2-up boat (incl. corrector weights) would also be compliant for 1-up after removing the jib sails and related jib hardware and WITHOUT EXCHANGING CORRECTOR WEIGHTS.
It seemed pointless to us to write the class rules in such a way that each crew had to carry around two different corrector weights; 1 for 2-up sailing and 1 for 1-up sailing.
Wouter