You for sure have some type of CX... Like others said if you look on the website of the hatchery it should be able to tell you.
We do 35 broilers every year, our last 35 were just killed at 12 weeks average weight 8-9lbs last Wesnesday. They free range at week 3 of age till the end. They are fed in the morning and at night. The last month we go through 3-4 50lb bags of feed that our feed mill mixes for us! Almost every 2 weeks we go through this much. I would say at 5 weeks of age they were 2-3 bags every 2 weeks. (if this can give you an idea if you are feeding them accurately).
There is nothing wrong with allowing your birds to free-range this shouldn't cause any issues with them not gaining weight. It actually keeps them healthier and yes way more active then when just cooped up all day.
At 10 weeks mine were still able to run ( but with a waddle), they would get up and roost on things. They were very calm mild birds.
Honestly I am one that spends way to much on these birds for how long they live, but I don't like them having missing feathers, and looking like crap. I changed there coop 2-3 times a week with new bedding, they were always left a "little" hungry so they wouldn't have the terrible leg issues. We had a large fan going in there pen to keep them stress free on days that were up to 100 degrees here.
Welcome to meat birds! 45 is a lot of butchering hehe! But they sure do taste good!
Good Luck!