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You did it right -- as long as you were listening for the null at the main listening position -- not at the sub.
That's why it's easier to put a mic at the MLP, run the sweeps, and look at the response on a laptop, which you can have near the phase control. Easier, but not the only way. Maybe you have a helper who can turn the knob while you listen?
The bottom graph looks better than the top. Keep in mind we're only really concerned from teh crossover frequency on down, usually around 80Hz or so. What it does above there is less critical. If you have 2 subs, there are some strategies you can use to use cancellations in your favor to get a flatter response. Details in this article on my blog.
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