I don't think it would be considered a back cross , but selfed.
yes , nearly 100% female
rhodilization as i understand it is an ultra-extended flowering time used to create hermi plants, dunno about the light leaks and or tendancies of offspring to hermi because of those leaks.
i've never seen a hermie plant change back, so i would say it will persist, just keep an eye out for nanners, hopefully it doesnt ruin your crop