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1084 just needs to reach austinitic state, the carbon goes into solution and it can be quenched. 1095 requires a "soak" time for it's carbon to completely go into solution. While 1095 will harden if heat treated like 1084 it can't reach its full potential without a soak.
As far as temps go, you've probably got 100F over and your still ok with 1084.
The last statement is very true. Different steel runs can vary in alloy content. The difference is minuscule but can change how the steel acts.
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