I read your tresiba reports and found them fascinating. I have talked to my wife about it already (I actually emailed her your thread), but have not discussed it with my son's endo yet.
Right now, my son is on a single basal injection (Lantus) per day, in the evening. Because he is into so many sports, different practices run different days of the week, it is pretty hard to adjust to what his practices do to his basal requirements. Long Swim practices (up to 2 hours at a time) are the worst, and reduce his basal needs for a couple of days, often till the next session. Meets, other sports and games are less affecting of his basal needs the following days. But he runs from 5 to 10 units of Lantus per night, depending upon the frequency of practices, intensity, and who knows what. I have not been able to measure the Lantus drop-off for him (he does not go high before breakfast, although he is insulin-resistant/glucose sensitive at breakfast), so I think it may last a full 24 hours or more for him. He is tall and skinny. a pretty typical swimmer, but he is into many other sports (soccer all year round, volley ball spring/summer, skiing in winter, etc). He also spends much of his free time outdoors winter and summer.
We are still playing with a single basal rate - but I can see that, within a month or two, we will have exhausted all options with that. In the past month, he has had 2 night time low (very mild, slow drifts) and probably 60-80 day time lows. On the other hand, 1 night out of 3 he has a 2am peak around 140-145. Of course, this could well be because we don't adjust his basal injection quickly enough to new circumstances. But we already adjust it 2-3 times per week. It is so easy to make a prediction mistake with the circus of all his sports practices. And we adamantly do not want to make changes to what he does because of diabetes.
Pump: we applied for an Omnipod with UHC - but we were just denied last week. Omnipod seems to be the only pump he can use, unless we are willing to see him disconnected hours per day (sometimes a 1/2 day for a swim meet or a soccer tournament, or skiing in a really cold day), since pretty much none of his sports allow for the use of a non-tubeless pump. So we are bracing for a long process.