We could toss a coin. That would seem to be the only way we could give her an answer since we both know unless the humidity and the conditions are just the way the plant wants it to grow, nothing we can say or do will make it happen.
I am honestly inclined to keep them OUT of the sun. Those plants in the GH get very little sun...they are are a bottom shelf and the ones in the 6 inch pots are the same...all are curly.....also, when the plants get older they seem to loose their curl.
I have asked my friend to drop in and tell us about her Bonnie. She also works part time at Home Depot in the garden center and I ask her about the Green Bonnie...I hope she drops in and puts her 2 cents in. I remember years ago when i was teaching an online class on breeding and handfeeding parrots ,.....it is similiar to raising plants in a way because what works for you just may not work for someone else. I usually ended my classes by telling them the things I did and learned and I was happy to share, but because it worked for me does not mean it will work for them. This is true with plants. Every little thing, the kind of pot, the air quality, the light, the humidity, the location, the soil, the water all those things need to be perfect to grow the perfect plant. None of us have all those perfect. So, we are back to square one. I never guarantee any information I pass on...but it works for me.
I have also feel that many of the Master Gardeners and others who think they know it all, really should not be so sure that the information they are giving will work for everyone. Totally impossible, but can be only guidelines. Just my opinion.