Mirage 3: When supersonic, the stick was back for level flight, so far that you could see the up-elevon in the rear-vision mirror. This of course limited the g you could pull, as you didn't have as much available/spare backstick. The elevons were pretty big, I assume to provide satisfactory supersonic control.
The centre-of-pressure movement when transitting Mach 1 was fairly benign if S and L (push it thru with a kick of the ASI and aft-moving stick), but severe if pulling G. If decelerating, the sudden forward movement when coming subsonic would create a nasty pitch-up of about 2g which if you weren't ready to counter would cause an embarrassing over-G.