I rarely start threads on here anymore, just not worth the agro. Hindsight is a marvelous thing. For all we know, 50 years ago that 35 acre field might have been split into 7 x 5 acre fields with hedgebanks for a reason. As has been said in the thread, re seeding at that time should have been better than doing it in late autumn before the monsoon season. It would have been nice to have a thread with helpful advice without the " Fu"king amateur " type posts, but hey-ho.I sympathise with this - lots of keyboard warriors like me telling the OP that they have stuffed up when all they wanted was constructive suggestions as to how to fix it (which I posted earlier). However...
The OP took a risk by cultivating high erosion risk soil in a high rainfall area at what is normally a low risk time of year to do this. Without taking a risk you get nothing done but here we are, with a field with the best topsoil gone. I stand by my post. If you don't take any responsibility you don't learn from it. That is all.