I am a tester of things as well. My best luck with Lantus came from injecting the main portion in the morning and reserving some of the remainder for at night. When I needed to reduce the amount I would reduce the morning dose first then the evening dose.
One thing about basal insulin I found out, if you inject more than you need, your own pancreas has a chance to store what its making for bolus. Problem is the hunger that goes along with more insulin than is needed.