Have you cloned my branch? Last I tried with the entire amount it worked just fine! Can you DM me with further details?
I have not checked everything but I have used stablenut.umint.cash and tested both cashu.me and minibits wallets
I investigated this and it seemed to be an error in the client. Like you said it treated the USD amount as if it were SATs. I have published a PR on cashu.me repo that should take care of the issue, but there is not much I can do about minibits.