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@Orko42
Find tyres you feel confident with in wet and dry. There are marginal weight gains, but body mass, riding style all need to be taken into account.
Most tyres are vulcnised in manufacturing process, which molecularly binds the rubber tighter to the base skin. Downhill tyres went through a phase of using Kevlar walls, which had massive weight increase, but when you're pounding down 35% Hills over rutts and scree, weight is pretty much the last thing on your mind.
Go for what you trust round town, work it with your mass, overall loaded weight (bike included), and set pressures to suit maximum load.
The tube will blow before the tyre will, but overload it and you'll pop the rim. downhill racing does teach some transferable skills. As does years of rubber moulding knowledge.
Trust it, ride it, carry on.