I think had you transplanted a tad earlier you might be further along. It looked like a shallow pot early on, that will impact it's height. Regardless, all that matters is how it is growing now. Stick to a dry/wet cycle - 1" dry before you irrigate - and it all turns out well (~20% runoff)
As far as what a hybrid does.. genetic variation is going to have some say on the matter of plant structure.