I'm a 16st plodder who runs 10k at about 8.5m-9.0/mile. An overpronator, I have over the last year worn Asics Gel Foundation, Brooks Beasts (did the FLM in these) and GTS8s (the latter suits me fine). Problem with all these shoes is I start to get the aches and pains in my knees and shins which tell me I need a new pair not too much after the 200 mile mark. Now most people say shoes should last about 400m, so I'm wondering whether I'm too hasty in discarding the old. Or is this a function of being big boned and putting my shoes under more stress than the average ronhillalike? Anyone faced similar probleMs? Any ideas what shoes might prove more durable?