It sounds like you have an older A-Class with the AL mast. These boats weighed around 200 lbs. The newer boats are 165 lbs and the general recommendation is not to exceed 275 lbs total crew weight. Keep in mind that A-Class are high performance singlehanded racing sailboats. The low weight is due to everything being designed and specified for a single sailor. It's not really the platform that is limited but the standing rigging. I would not recommend sailing with 160 kg of crew weight except in light air conditions.

Use the right tool for the job. Get a doublehanded boat if the majority of your sailing will be with two people.