Hi Madeline, I don't use Lantus so I can't give you dosing help, although 63 seems to me to be too low to shoot. Try posting on the Lantus forum, you'll probably get more help there.
I would not. Mabye 0.25u. Do you have plenty of test strips and HC food? Are you willing to monitor and intervene if necessary?
If you want advice from L&LL you should update your spreadsheet.