When you do it like this, the one in dffs_PreSaveAction will always win.
I haven’t really thought about this, but you can do it by adding this snippet to your dffs_PreSaveAction function:
if(window.top.DFFS_redirectInfo === undefined && typeof _oSTSNavigate === "undefined"){
// The form is NOT saved with the Save and Stay button and you have NOT used the spjs.dffs.redirect above this line
spjs.dffs.redirect("ADD_YOUR_REDIR_URL_HERE",false);
}
Alexander