It is possible to grow most Orientals so that their leaves are much larger than they should be. In order to end up with leaf that provides the flavors and aromas that you expect from Orientals, they need to be planted much closer together (6 to 12 inches apart), and produce relatively small leaves. I agree that Prilep is an excellent choice for both quality and productivity. With my Prilep, I space them at 12 inches, prime the lower leaf as it matures, then stalk cut the remainder late in the season. For both primed leaf and stalk cut, I sun-cure them for 3 to 4 weeks, then kiln the leaf once it is cured.
Productivity in Orientals is from a greater leaf number, rather than a smaller number of huge, mediocre leaves.
Bob