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I would never say they are weak. But you are either running a 30" wide tank, or a 30" deep tank, one way or another, it's a big tank.
Also what I mentioned, it depends on what you are trying to grow. I have a 72x24, I am running 3 XR30s and 2 Quantas (pretty similar to Orpheks).
This looks like turf algae, not a regular gha, which is tougher. I agree with MadReefer, identifying the source is important. Zero nitrate and very high phosphate is also suspicious especially since you’re doing water changes. Brightwell razor might work well for you.
Where in north nj are you?