Dario,
Once you get your trident trunk the size and taper you want, then you start working on branches. Depending on how thick you need them determines how often you cut back. If you need a lot of girth, yes, cut back less often if you are still getting rank growth.
Here's the key: when you grow out trident limbs, you wire the new soft shoots while they still have leaves on them. Use aluminum wire. This wire will only stay on a moth to six weeks before it is removed. Once the wood lignifies, it's set. Typically, we don't wire old wood.
Let the new branch grow out until it starts to slow down, then cut it back to the first vertical pair of buds (leaves). You know how tridents alternate at each internode: horizontal then vertical, the horizontal etc? Cut back to a vertical pair. I know, I know, it sounds wrong! Then when the new twigs get to 6 or 8 inches long, cut off the downward growing twig, and wire the upward growing one down. Also putting in some side to side wiggle. This makes for an undulating branch as it builds taper. Repeat this every 6 weeks during the growing season.
Your goal is to build an undulating branch which has taper from the trunk to the tip.
It takes a decade to really do it right. Yes, it actually takes longer to develop good deciduous branches than it does pines or junipers.
You're young. Make it happen!
It's the taper and undulations that separate the masterpiece trees from the "good" trees.