@Anonymous
Only With the image we can't help you much, attach your model file here,so that we can help you with your first problem.
For checking the minimum radius and maximum radius currently we don't options in the inventor cam,
But I hope you have access with fusion 360 there you can check the minimum radius with ease, I know it is hard to tell you this but these days very hard to get the inventor cam updates.
Regards,
Boopathi