If you suspect electrolysis is overwhelming the battery recombinant capability, carefully examine the ends and sides of the battery. The walls will noticeably bulge before venting.
A similar thermal test should be conducted on a 5% antimony flooded battery, using constant voltage 14.8 volts (unlimited I) to gainsay the hypothetical theory-bound wolf-cries of novice theorists. Temperatures does rise, eventually. But reading articles penned by amateurs posing as experts can be thwarted by doing one's own tests. Voltmeter, Ammeter, Pyrometer, eyesight, and use of frontal lobes.
By the way, high voltages for AGMs should be reserved for conditioning and capacity restoration. Excessive positive plate shedding should be avoided.
