TOTTIGOL
1. The IFR reserve at holding speed.
2. Helicopters burn fuel as they fly (you might have noticed) you therefore take an average between them listed figures. You are using values at the MTOM.
3. The cruise speed at 7500 is 156 KIAS. I have seen it with my own eyes.
4. The MTOM will be certified at 7800 kgs very soon. At 7500 the published radius of action Auth 16 oil and gas pax is 140 mms. At 7800 this will increase to between 170 and 200 depending on the mass of the pax. These are mathematical facts.
5. There are very few baggage bumps in an EC225. You are fantasising.
These figures are available in the public domain.
You are making yourself look desperate. Keep trying!