Extending 990v6 durability

So I over pronate something fierce and the 990v6 seems to be the only shoe that actually helps. I don’t mind paying for something that is high quality, but the durability on these things are awful.

I walk about 3-4 miles and im lucky if they last 3 months. My current pair, all the support just collapsed and died after barely 3 months. I got tired of spending $200 on shoes every 3 months so I bought a pair of super feet insoles and I was able to extend them another 2 months. But here I am once again, my lower body in agony as they just very suddenly gave up and even with the insoles there is no support for me.

I’m not small, I’m 6’3 and about 260. But also they aren’t small shoes, I’m wearing size 13s the soles are really thick. I just wish they would last longer.

Any ideas how to extend durability for the soles?