@jeanwilson please tell us if you are writing spontaneous thoughts - on your practice pages - just letting the text flow spontaneously from your thoughts of the moment.
Up until just a few days ago, my practice has been drills, many specific letters, and then duplicating single words from Sulls'
Learning to Write Spencerian Script. I had decided that a word-at-a-time practice wasn't contributing, necessarily, to learning word spacing or being able to produce attractive sentences. The sample you see is my second day of attempting to write spontaneously, as if composing a letter -- sometimes a random line or a few words from lyrics in music I hear playing.
Or do you do some of both - if so - what do you notice (if anything) about the difference between the two?
Is there anything like *target fixation* happening?
I haven't been practicing the spontaneous writing long enough to make this observation. I did see a missed letter in a word in the sample page. In my previous "single words" practices, I do note that focused much more attention and intention on making the letter shapes as accurately as possible. In my "fluency practice," I'd decided that I wasn't going to fret so much about letter shapes, but work on smoothness and rhythm of pen technique and trying to keep those 5 items as present as possible while doing so. It has been challenging. I had once read a book about music practice and relaxation -- it is so easy when practicing music to get tensed up about "not making mistakes," that the music becomes hindered. There was a really fun practice technique that said to imagine that you are in a universe where the beauty of a musical performance is presented by how relaxed the performer is and that incorrect notes or other things we consider "mistakes" have zero import. This is similar to the concept of what I'm trying to do with the writing -- suspend criticism of the letter shapes and instead pretend that the beauty comes from relaxed, rhythmic pen technique.
Also - confirm what your goal is?
As I recall, you want to adopt Spencerian for *everyday* penmanship.
Correct. "Everyday penmanship" meaning correspondence to loved ones and acquaintances ... the desire to keep alive handwritten letters and the history and art of this once ubiquitous and beautiful practice. Hoping one day my hand will compliment, and not detract from, the sentiments of my correspondence.
If that is correct - are you still going back and forth - using your regular penmanship when you are not doing your timed practice
- or do you use Spencerian when you are adding an item to the grocery list, for example?
To be honest, with computer technology I find very little reason to hand write anything. I do enjoy journaling and have been keyboarding entries, yet would love to incorporate Spencerian into my personal journals one day should I pick up enough fluency. My near-term goal is to improve enough to where I may replace my personal daily handwriting practice by
actual mailed letters ... what a concept!

Outside of pen practice, our household is virtually paperless, but we do have a little glass picture frame with erasable ink markers for leaving reminders to each other. I have used Spencerian for that, usually few words at a time.
Can you guess where this line of question is headed?
Hmm ... my guess is that reverting back to one's "regular penmanship" may be an impediment or distraction to learning a new way of writing? My "regular penmanship" is execrable -- see "before" sample of my writing. I affected a horribly tense "caveman grip" with results looking like they were written with a lump of coal, and hand stress after only short periods of writing. I was very much attracted to Spencerian because of the descriptions of pen grip and whole arm movements so different from what I'd every employed. I figured I could start over completely as though I were back in kindergarten. Setting frustrations I've experienced aside, this is the first time since I started that I pulled out that "before" page to look at ... wow! While I'm not at the level I'd like to be (is anyone? ... well, maybe
@Ken Fraser 
) I guess there has been improvement.
Looking forward to the "5 different things ..." Do tell!