You have much more experience than me, but I believe with stimulants too low a dose is much better than too high a dose. During titration I tried the dosage immediately after and I was a machine, both in productive output and in emotional bluntness. I could've reached my full potential but honestly, it's not worth it.
Now I feel with good diet, good sleep and a little exercise I'm operating at 70% of my capacity, while the rest of my life I was running at 20%. This is good enough for me. When I'm off the meds I can see only negatives: hungry, horny, restless, bored, anxious. Perhaps a little more lighthearted, to be honest.
My problem taking a smaller dose is that it puts me to sleep. I sometimes split my original dose to use as a sleep aid because I get great sleep on it. Falling asleep on adderall was not fun to tell my doc or the pharmacist when I first started on adderall. I was recommended for more screening. It still makes me tired for 10-15mins as the first dose kicks in.
Lighthearted is a good word to describe the differences I feel as well. Though I am quite hyperactive, maybe they are related--bouncy and lighthearted off and matching the calm of the Vulcans on them.
As some comments above mentioned everyone is affected differently. I have been on adderall for well over a decade, and constantly for the past 5-6 years in which I formed habits and routines that never stuck when I would go off and on due to hating the 'blunting' effect I felt it had on my creativity and personality.
So a couple months ago when I couldn't find them in stock anywhere I figured no big deal, I could keep doing what I was doing and maybe I was using the meds as a crutch anyhow. I was hoping I would get my old 'fun' personally back to go along with my new older-wiser-mature-self that had good work habits and routines. It's been such a complete disaster I had to ask my doctor to lower my dose because that was the only strength one pharmacy had left out of over 20 stores I called, and had them search other branches. Now I have to choose which days to take them because I have to take twice as many to get the workable dose. It sucks.