HI Krisalv, well it's a composite part which can vary in production. If you feel it is out of the tolerance, then please follow up with the shop where you bought it and process a warranty, we cannot handle that here as we do not sell online ourselves.
Personally I have never really worried about 100-200g of weight on any board I have used, with a 98L slalom board you are normally sailing in winds of 20-35knots, control being the major factor, not having a light board? But that's up to you of course, so please follow up with the Dealer where you bought it.