Have you had the chance to set up a SS? If you need help, we can help you with that. It makes it much easier for us on the board to give advice.
As for feeding, the idea of feeding twice a day is old school and more geared towards insulins like Vetsulin. Feeding meals throughout the day is easier on the pancreas and keeps kitty happy. It's up to you how much you feed throughout the day but you want to feed the majority of food before nadir (or the lowest point of the cycle). Each cat's nadir will be differently but typically, with Lantus, it's at +6 or 6 hours after injection.
The more you test, the more you'll know and learn about how Gracie uses insulin in her body. Data gathering is very important when dealing with feline diabetes.