All the guns of the T-64\72\80 tanks do not have the correct vertical guidance speed; there is also a misunderstanding of the terms of the person who set this parameter.

Yes, indeed, everywhere it is written about the VN speed of at least 3.5 g. per second, this suggests that this is the minimum threshold for the maximum VN, accordingly, these figures are not the maximum values.

In T-64\72\80 tanks there is a junction box with potentiometers with which you can adjust the maximum speed of the GN and HV

It turns out that 3.5 gr. This is the minimum upper VN bar, and the full maximum without a prefix is no less than 8.5 g per second

such a device is found in all of the tanks listed and applies to all stabilizers, namely 2E23, 2E28, 2E42

Based on this, I ask you to correct the VN values to 8.5 deg.s. on tanks T-64A,B\72A,AV,b,M2\80B,U.

Bonus

Illustrative examples of vertical guidance demonstrations

testing the T-80 in Germany with a timer https://youtu.be/wYgOXmiAbsM?list=LL&t=370

T-80UD stabilizer 2E42,

https://youtu.be/GZCbosx5Zpk?t=2116