I'm 100kgs and a 12m will not cover the wind range you're asking about. A 12 for me is 18 - 27mph.
At your weight and the wind range you are asking you need an Ozone Zephyr.
And when you improve it will be your lighter wind kite and you will need a 14m, followed by a 10m
12m is a bad choice as a 1st kite, trust me, been there done that.
Only listen to people who weigh the same as you. Anyone lighter will not understand what we as the larger gentleman need
I was advised by many that a 12 was what I needed when I started.
So I got a 12, I floundered for ages.. then I saw someone on a Zephyr and saw that was the answer. I bought one and lived on it for a year, riding a Shinn King George 144x46.
I went from no where near enough power to having plenty. The Zeps have a massive range, esp. for larger guys. I could hang onto mine in 23mph, As I got better I started using a 14m Catalyst, saving the Zep for lighter days. Then using a 10m in 25 - high 30mph days.