Instead of Deloading week 4, just go back to Week 1. Then do that workout a little better. Then repeat Week 2, only do it a little better/harder than the first time. Continue. The "6th" week will be a slightly tougher repeat of your first Week 3. Then, reduce intensity again. Go back to Week 1/Week 4, just do it a little better.
Each 3 week cycle builds on the last.
Every set/rep range has a "perfect" weight range (percentage of 1 rep max that works best for that set/rep range.) With Linear Progressions, you start out cool. Weights are good for the sets/reps you are doing. Then you add weight. At some point, you add too much, and the bar is too heavy for the sets/reps you are doing.
With the wave load, you stay in the gain zone. You add a little weight, then wave back before the weights get too heavy. You stay in the productive range and slowly get stronger.
You could steal Wendler's 5's Progression to get started.