Type 1 with low basal needs

I’ve had type 1 for 49 years and have needed less and less basal insulin. I’m now using only about 7 units of Lantus a day.

It used to be about 16 (of nph though) divided morning and evening, of course.

Depending on how much I’ve eaten or how much activity, it’s sometimes only 4 units!
I read something about a condition called GSD— glycogen storage disorder, and I might ask the doctor about that soon.

Is there anyone that has had a similar issue out there?
Thanks in advance.

CM in Ga