you say that the sub 67.5kg guy squatted 285kg. this would have still been entirely possible for you at that time. You say you had 235kg on the bar. an olympic size barbell weighs 20kg (not 7) making it 255kg add to that the fact you did TEN reps, your 1 rep max would be significantly higher not to mention he was probably equipped (squat suit wraps etc) and your 1 rep max would have been huge. sure that guy was in a lighter weight class but your missing the point entirely, they specifically train the 3 lifts, whereas you sound as if you are just the regular gym goer, therefore your potential would have been even bigger. im not saying you would have broken a record but your claim suggests you would still have been one of the strongest in the country.