Technique... technique... technique...
There is no argument that someone with good skill and great technique will do better than someone without. But that is not what the OP is asking about, nor does any of us (Unless someone here knows the OP outside of virtual candy land) know the OP's skill or speed into the corner or how far he was leaning. Unless we have video showing any of this we are all pissing into a fan.
So regardless of skill and technique (as these are variables X and Y but should assume they are fairly consistent with the rider) What we do know is the type of tires he was riding.
So the question is... if you take a corner on those vittoria tires from a paved farm track road and turn onto a more "gravely" road say 1000 times or ride another tire like Terreno Drys or Gravel King SKs 1000 times into the same corner, which tire will give out the most? Say a percentage?
Is it the same experience with every tire going over those surfaces everytime?
(Because thats what the "Its only skill not the tire" peeps sound like... regardless of tire its the same outcome and only skill will make a difference)
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Witterings feel free to correct me if I am wrong here but I think that's what the initial curiosity was.
Sorry for the spill. That sucks and I am one step behind you in age and I'll be darned if each year it doesn't cost me twice as much in time and doctor bills each time I get hurt.
My experience riding slicks in the summer and 35c treaded tires in the winter is that the treaded tires do make a difference. Especially in the layered surfaces. When its a fine layer of gravel on top of a paved road though I think the percentage of save from the treaded tires might be slim. I think (as mentioned earlier) fatter tires with lower air pressure would be the best bet (they may catch before completely going under). The ball bearings are a great example here.
-Sean