80kg is fine, im 14.5 stone (92kg) and only find that its the most roughest of roads that causes me to feel the suspension is hard. Ive just turned my suspension up 2 clicks as i found ive bottomed out the rear suspension once or twice and even got my bash plate to touch the ground on a few outtings
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I cant think of a solution to soften it up un less you want to add more wieght to the rear of the bike to try and create more load on the suspension to soften it off. either that or a new softer shock but dont think you wanna go there���