The 1% hold is pretty standard across all custodials. Withdraw 99%. then withdraw 99% etc till you get down to 2 sats
It'd be nice if they accurately described what the hold was. I tried 95% and it failed saying I have to have 1% reserved for fees. 🙄 Now that I'm down to 10 sats, I can send out a single sat. One of us doesn't know what 1% means.