In relation to hi-starts and ARFs, I would not be concerned. We have lots of ARFs and RTF sailplanes in our club. They all hi-start very well, even off the very strong hi-starts made for 3M+ planes.

My RTF spirit has been winch launched many times. Under the control of experienced winch launchers it has launched fine. I broke the wing on a launch, but I think I put too much "pedal" into it. I am still very new at this.

I am sure some ARFs are weak, just as some kits are poorly cut, but the ones I have seen seem fine.