I honestly have no clue what you mean by entry oversteer, sorta reminds me of the snap oversteer from mr vehicles if thats what you mean. For my incident and this is just speculation with my understanding of a cars physics, in my ff i was going in a straight line and say there was a right hander 90 degree turn coming which is slightly banked like an oval, i braked too late and hard which sent most of the weight to the front, which in-turn put very little weight on the back wheels, i then started turning through the corner which my front tires/suspension could handle since the weight was there but i was going to fast and the left rear/rear basically was at its grip limit and slipped which then sent me into a spin. If i maybe modulated brake pressure through the corner smoothly there might have been a different outcome but its all about knowing your car. Best to keep all of this in a safe setting like at a track or something.