The .70 - .91 is all you should consider for the ARF version. ARF's are not known for epoxy and reinforcement where it's needed. This plane is a trainer, a non-symmetrical wing, with incredible lift with the wing area it has.
If you had a specific purpose to increase engine size over a .91, you'd want to make modifications to the firewall, bulkheads, wing joiners, and keep your prop pitch down.