Without knowing it, i would say evo liftet harder because you had the evo 10 and it should be a bit more explosiv than the 12er Rebel. Could also be the reason why you landet softer on the rebel, but its said to have enormous hangtime anyway.
That is true that smaller kite could make the difference. However I flew Evo 7m2 the other day. It should be snappier than 10 and it is a bit faster but the lift and the overall feeling was so close to the 10m2 that I think the most difference comes for sure from the different kites. Rebel is softer to go up and down during the jump than Evo. Rebel has better hang time than Evo but Rebel requires that you time the jump right and hit the sweet spot when Evo is cook proof to jump.
I was happy to riding hard with 7 and it was so stable in the higher end that I just had fun even the other complained how gusty the wind was. I think that Evo has changed into better and more versatile than it was and has better performance overall.