Nice job "winning" the course. :-)
As to your feet, blisters and toe bruises says you're wearing the wrong (or wrong size) shoes.
New shoes, yeah, guess so. The mystery to me is why my shoes which were perfectly fine last year now aren't. OTOH, maybe this means that I've finally started my teenage growth spurt. Whoop, whoop! You know, the one that all my boyhood friends got and I didn't ...
Feet change (usually getting wider/flatter, depending what you started with).
There may be other products you can use to avoid blisters. I've successfully used waterproof adhesive tape on blister-prone areas. Depends on what is causing the blister.
But still, you had a great run. :-)