Ground level Helipad Cat A gives about 3800 kg for the B at SL and 30 C. I think the B1 offers about 200 kg more - but 155man will have the graphs, I'm sure. I'd be surprised if an EMS a/c was that light, as you'd have gear in the back plus at least one extra crew, wouldn't you?
Not sure what you want to do with "real world figure" - you can't plan on them legally, and you certainly won't want to restrict these weights further. Assuming the relationship between training weights and real weight is correct, the aircraft performs as advertised during Cat A OEI work.