HobbyZone Carbon Cub S+ 1.3m with SAFE Plus Technology is in RF9. I guess you could try using the aircraft editor and scale it up a bit? Maybe try 162%.
Edit; Tried 162% scale and edited fuz/prop to 14.5in. Seemed to fly ok. Certainly a lot easier to see, lol!
Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever Never ever ever ever ever scale a prop. Always always manually change the diameter and pitch.For the most part I've found that auto scaling with RF9 works very well up to ~125%. Anything higher can be a bit hit/miss. If it does not seem to fly right you def may need to check total weights and CG.
The prop size never seems to scale up/down properly. Did this with RF8 as well (maybe earlier ones as well, cannot remember. I just go to the fuz/prop and increase the diameter accordingly.