70/30 is the simplest type of insulin ratio, and often doesn't have great results because it is the type of insulin that is least similar to the body's natural insulin release. You would be much better off with a long acting insulin once daily and using a short acting insulin whenever you eat. Using short acting insulin like Humalog more closely mimics the body's usual response to increasing blood sugar when eating. A longer acting insulin such as Lantus helps maintain better blood glucose control by releasing a more or less steady rate of insulin. This controls spikes in blood sugar throughout the day, for between 18-24 hours. Using a system like Lantus/ Humalog pens requires many more shots daily, upwards of 4-10 depending on how frequently you eat throughout the day, but it is well worth it in preventing complications. Unfortunately, 70/30 is the cheapest solution for insulin routines, but you get what you pay for. Talk to you endo about your concerns with the 70/30. Good luck.
Wallis