Les,
As you mentioned, the quality of the creamed honey is based on the size of the crystals. The size of the crystals is based on the seed cream honey.
Find someone selling what you want to make and use it for the seed.
To make 10 pounds of cream honey you need 1 pound of cream honey. In other words, you use 10% seed to make it.
Jim Altmiller
JIm as someone who makes and sells a lot of cream honey....the size of seed crystal helps, but the crystals will still aggregate into larger coarse crystals if just left to set. If you can detect ANY crystals in your creamed honey it's not the best creamed honey.
You need gentle agitation to rub crystals against each other to break them down. I have a machine, like a butter churn that works the setting honey for 15 minutes, rests it for an hour and repeats for around 2-3 days until I judge it ready (it should be white, any other shade shows larger crystals present). The friction of the crystals rubbing against each other is considerable and even when I make it in my garage in the winter with temps around 4C the mixture will read 21-22C due to the heat generated by this friction.
Before I got mechanical I used an oversized potato masher as this does the same job, but takes effort, 5 minute every 2-3 hours for a few days....