would 90/10 struts be horrible when cornering?

They won't be good. They will allow nearly undamped front rebound travel and heavily damp the compression, encouraging your car to jack up in the front during transitions. That leads to several other problems, including higher CG and more jacking due to a higher roll center. If you mean just for street driving to the grocery store, I imagine you can get away with with. But they are a very low-performance handling option except for the purpose of drag racing.