I found this:
Rule 16.2, Changing Course
This has now been restricted in its application so that in addition to rule 16.1, when after the starting signal a port-tack boat is keeping clear by sailing to pass astern of a starboard-tack boat, the starboard-tack boat shall not change course if as a result the port-tack boat would immediately need to change course to continue keeping clear. The rule therefore applies only upwind, to hunting by bearing away – the ‘dial-down’. The standard provisions of rule 16.1 cover hunting by luffing.

So it looks like 16.2 does not apply since it only comes into play going to windward.

So the key rule here is this:

16.1: 16 CHANGING COURSE
16.1 When a right-of-way boat changes course, she shall give the other boat room to keep clear.

Mike Hill