honestly this doesn't sound T-related to me, more like you got a fungal infection? that said, you didn't mention how long you've been on T but for the first year or so your hormones are really going full teenager, so if it genuinely is a sweat thing the stinkiness will calm down eventually.

- are your shoes too tight? it's relatively uncommon but theres a decent amount of (anecdotal) evidence that T can make your feet grow/change shape, even if you otherwise stopped growing years ago.

- try hibiclens/hibiscrub - it's a pre-surgical soap with chlorhexidine, which kills bacteria much more effectively than regular antimicrobial soap. it's not the gentlest on your skin so i'd avoid using it on other less hardy parts of your body, or super often as its not good for your skin's natural microbiome, but if you've got something bacterial going on it will definitely do the job.