Trying to tune my x-y speeds and wondering If I can adjust them once a file is running?
There is a speed and feed override that allows you to do this. You can do it right from the WebUI. You can increase and decrease the feed speeds by +/- 1% and +/- 10%. You’re looking for the feed override. You can’t do a spindle speed override unless you have a spindle with speed control.

That is WebUI v3, but this is the related FluidNC documentation that shows a screenshot for WebUI v2.
http://wiki.fluidnc.com/en/features/speed_feed_overrides
I believe doing it this way will adjust all axes by the same proportion, so may not allow you to tune the X velocity separately from Y.
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