Not sure if there's anything I can do about your controller's input delay unfortunately, this doesn't seem to be an issue for the controllers I've done testing with (Xbox One, Switch Pro, and Dualshock 4), but I'll try to look into it when I can. If I may offer advice for double lines as of now, try to remember that the icon always just moves down to the next line as soon as it reaches the end of the first one. Thanks for the thorough feedback!