Gene, I would let newly rooted cutting grow bigger especially you are up-potting for now. Perhaps grow it in a 2 gal pot to give new sprout the "space". Newly form leaves helps the plant to get ahead. In your zone, it will grow quick & it can be top very soon. The other option is - Instead of topping, if it is a rare one, you can even have a 2nd plant by piling a mold of dirt around the side growing bigger branch & removed it as a gift for someone. Its a happy issue.
I like the manner you have the cuttings rooted. Easy to re-pot with mininum damage to new roots.