Hey Centaurus
Worth saying something after your comments about those Mk 30 Vampires going in with a Mach tuck.
Those accounts of pilots diving in with the stick hard back had me thinking when preparing to test a Vulcan at the corner of its manoeuvre boundary - 2.5g, 420 KIAS and 0.98 IMN. A little excursion over 0.98 and we lost control as it pitched down with two pilots now pulling the stick hard back against the stops. I warned the crew that we were about to go under with relaxed back stick to come up the other side and a roll to right way up. Fortunately increasing air density gave us back some elevator control and the means to recover without negative g. Max IMN observed was 1.04+.