Bed mesh doesn't seem to apply

So i have a bed mesh deviation of 0.27 on a V3-500 using a Beacon. I thought that'd be enough to get a perfect first layer. What I'm seeing is that the from about 300+ on the x axis up there is a noticeable gap under the nozzle and isn't close enough to get any adhesion. I've been in the process of squaring up the frame and with a 0.27 variance, it's probably as good as it gets. Any idea what would cause an irregular mesh application?
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