Nees help with the planes specs

It has been a while since I flew in Aviatife. I stopped thinking that this problem with the specs of the airplanes would go away. I came back today to dly a little job to see if things got better. I decided to rent the milviz 310R CGTER. The exact model that shows up in my aircraft selection in msfs. Trying to start the flight I can not because in your specs the cruise speed is 171 but my plane reaches 181. Well…big dissapointment. You should have a way around for these small differences. I am assuming nobody else who has the 310R in his hangar can fly this plane. So why do you have it on?