Interesting observation. I used Humalog for about 20 years before recently switching to Fiasp. From time to time people here would say what their doses were, and I’d think, “Wow, do I ever take a lot of insulin!” On Fiasp I haven’t had to change my basals or IC ratios, but my correction factor has shrunk from 1.8 to 2.8, to account for Fiasp’s up-front aggressiveness compared with Humalog.
Humalog for me had a really long duration–a particular nuisance overnight. But whether that (or the tail) grew over 20 years, I honestly can’t say.
I don’t recall ever having occlusions with Humalog, either on Omnipod or years ago on a MiniMed. And any site irritations were caused by dumbness and leaving the site in way too long. (Can’t say the same for Fiasp. Five days after removing the first Fiasp pod, the site is still a bit red.)