As I said in op, just don't know the answer, but seeing the "girls" having a consolation hug after the 800M and listening to their comments in post race interviews, there is something not right.
Perhaps in time we will understand more, after all I can remember when Lasse Viren was openly blood-doping, but apart from a general air of bafflement no-one paid much attention - it was his own blood, nothing wrong with that then.
So maybe when the experts come to a conclusion this will be sorted out - at least it appears to be a genetic condition so is "natural", unlike Kratochvilova's 800M record, where she also had some very male attributes, but that was a different era and may have been the result some serious substance abuse!
Your running shoes should be at least 1 size larger than your ordinary ones, even 1 1/2 depending on make, rough ruleofthumb is a thumbs width between end of big toe and tip of shoe when your'e standing upright.
Too tight and shoe rubs = blisters, but also too big/wide and shoe moves around causing friction blisters.
Fit is all, or you may just have thin skin and need to do more mileage to toughen up.