Damo65.... I have flown my Gyrobee with a 447 at my home airport in New Mexico for 50 or 60 hours now. Altitude is 3200 ft. and DA will go to 6000 ft. I have 24' Dragon Wing blades. I weigh about the same as you and my gyro weighs in at 310 lbs. After training and starting to transition to your own gyro, you will learn rotor management very well if you take your time and learn your machine.
I am not able to fly when it gets over 75*F.Tthe 447 is just not enough. That being said, I have flown a lot below that temperature. Climb rate is only 25 0r 30 feet a minute on some days. I just take it easy and stay in the airport area until I get several hundred feet of altitude and off to explore the countryside.
I had some members say that I could not fly with a 447 at my altitude. I was just going to kill myself.I had several members encouraging me saying I could fly just fine with practice. I spent many hours flying the runways and over the airport learning my machine.
By the way, my machine was built by a gentleman living at sea level. He was about 250 lbs. and the gyro weighed just over 300 lbs. and said the gyro flew very good at sea level. Several videos of him flying. I bought the machine from another man who was about 175 lbs. and flew at elevation of 600 ft. and the gyro flew fine. Not a hot rod, but was a joy to fly.
I found that with training and time spent being cautious and learning my gyro, I could enjoy flying. Many people on here said I could not fly with my conditions and setup. I am glad I did not listen to only them and that I talked to people that had flying experience with a 447. The people on here can be of great help!
I now live where the elevation is 800 ft and the gyro does very well. Such fun to fly! I hope you get the training and then take the time to learn your machine and have a blast flying it!