I have been following the guide posted on Reddit by NilacTheGrim and endorsed by Mark Blunderberg, but I'm getting an error when I try to make the second transaction to myself (the SV one) on the shorter blockchain. It says that the transaction was rejected by network rules (txn mempool conflict). This seems to be a double spend error which I guess makes a bit of sense consdiering what I'm trying to do, but this process seems to have worked for others and I've switched to the lower height (SV) server so I'm not sure why it's not working.
Does anyone have any ideas?