I've spent hundreds on many different trail shoes and blisters are still a problem. Some shoes are better than others but I think it must be some other factor. I naturally have sweaty feet and I'm carrying heavy loads both of which contributes. Wrong socks maybe? I've tried a bunch of different brands/promises but I'm willing to invest some more if it helps. I don't want to buy any more shoes, I've got plenty, but I can change the socks, insoles, etc.

Any suggestions? I'm not sure what I'm doing wrong here.

edit: I'm not in the US. Someone also suggested toe socks, seems gimmicky to me but if someone here thinks they're helpful I'll give them a go?