On close distance you simply did not admit them. On your party there was an aircraft, satellites and excellent communication. This all speaks about your excellent tactics, but not that does not speak that all this was possible in the USSR.
Speaking that war in Iraq has shown opportunities of the USSR, you resemble the person who beats the teenager, and then speaks that it also is ready to beat any adult person.
About 105mm gun. This gun could struggle easily with Т-55, Т-62 and Т-72A. However to 1985 in the USSR have started to be made T-72B, T-80B, (and it is fast and T-72BV T-80BV T-80U), and against them on greater distances 105мм gun was weak. Therefore it has been replaced on 120мм gun.