I took Lantus for about 12 years and only changed when I moved to an insulin pump.
I always felt in control of my insulin dose: I lived with it 24x7 rather than the 30 minutes my diabetes teams saw me each year.
If you feel you need a larger basal dose, are you comfortable increasing it (slowly) yourself?
The great thing about Lantus compared to very longer acting insulins like Tresiba is the impact of a dose change can be seen the next day.
I too found it did not last 24 hours but managed this by taking my dose with my evening meal and using bolus (and exercise) to tide me over the 2 hour gap. Some people split their Lantus to take two doses 12 hours apart. This overcome the gap and allows a slightly different dose at night to the day time.
Lantus is still my backup if my pump fails andI am comfortable keeping it.
@JohnJ in your position, I would be taking back control from the two teams who are telling you how much insulin to take - they can advise but you can chose how much insulin to take and when to take it. As
@Jaylee suggests, take a basal test and gather evidence for your body about how your is reacting.