as with all agricultural crops there will be variations from year to year.
Quite true. They can also vary from location to location within the same year.
Last spring I planted some hops about 30 miles apart. The hops from one location had much stronger aroma than hops from the second location. That was true of both varieties. (I planted Cascade and Galena rhizomes at both places. Centennials too, but they never took off.).
The hops from the second location were bigger and appeared healthier. But they smelled grassy. Hops from the first location were smaller, but they had stronger hop aroma. This held true for both varieties, so I don't think it was a varietal issue. It was an environmental issue.
Conditions varied from one location to the other. One had regular water from drip irrigation. The other depended on rain water, and my occasional hand watering. I used different fertilizer at each location. One location had some afternoon shade. I'm sure the soil types were different.
It may take me a while to learn to grow hops well. Maybe a long while since there is only one growing season per year. I grew up farming so I know little things can make a difference. No different from brewing beer in that respect.