This is a problem... I just pulled this up, as I'd never really played with the AT-6 on G4.5. You must be trying to land waaay too slowly, 'cause I couldn't hardly get it to stall. I think one of the problems with Realflight is that the planes are too hard to stall. And yes, I'm running on the most difficult setting....

Do this for practice on the sim: get it up there a little ways and cut the motor and practice deadsticks. Do this until you can reliably land the various warbirds from all kinds of positions. You can also set the flight failures to kick in a lot. This will improve your skills. Also try setting a stiff (15-20mph) crosswind and practice landings and takeoffs.

You can do a lot of things with the sim to make it harder and work on your skills, but assume just about anything real is going to be harder to fly.

I would definitely spend considerable time with a 60-90 size warbird before putting a Ziroli anything in the air. That's a lot of work to risk...

BTW, the new H9 Mustang is a pretty nice ARF. I just finished mine (re-liveried as "Excalibur") and plan to maiden it tomorrow. Yes, I know the exhaust stacks are missing, I bought some resin ones to replace the crap vacuum molded ones that came with the kit, and I haven't had time to install them. Going to maiden it first. I'll let you know how it flies...