As you know Nicole, the peaks for insulin vary from person to person and will over time change some. You will need to change somewhat and watch what happens to you - diabetes and insulin is NOT an exact science.
But for you, I’d be very cautions taking your long-lasting say at 7: 00 AM because now you appear to be having your 60 to 70 lows about 21 hours after you dose. Of course, these 6 to 7 PM low BG could be caused by “insulin stacking” - your lunch-time meal bolus. I’m not a medical doctor, but may I suggest that you try your Lantus for a few days mid-morning and that may help and it may also take care of your wake-up highs.
The bottom line: be cautious, make only one change at a time and analyze what happens - you sound very intelligent and that you have good common sense.
Good luck, Dennis