A few things I'd say off the bat is continue to stick with heavy compound movements as the basis of your workouts. Make sure you're nailing your form on all reps and exercising full range of motion. These will help with general growth as well as proper weight distribution throughout the exercise, all of which can help bring your body up symmetrically, especially early in your lifting career.
Now that I've made that plug, a few things that have been holding me back a bit. Now I haven't lifted for too long either, about 3 years, going on 2 years of lifting consistently as well as tracking calories. But still, I'm a decent size. However, I had problems with asymmetrical triceps and it wasn't until maybe 2-3 months ago when I noticed that I have a real tight left lat. I noticed this when I do tricep stretches, and the left one always takes a little longer to work it right because the left lat is so tight it's actively pulling my arm as if I was activating the tricep itself. In essence, I think my tight left lat sometimes does the work instead of my left tricep, so at the end of the day my triceps aren't being worked evenly. I haven't actually done much in the way of fixing this, but this might be a point you could investigate and attack later.
Anyways, if you actually have a strength issue between the triceps (as I said, I don't ever notice a strength difference doing skulls, french presses, close grip benching, dips, anything), then I would work on unilateral isolation work for the triceps, like one arm tri pulldowns, or one arm skulls. Maybe at the end of the set do an extra few with the lagging arm.