Cross Slide started "Stick-Slipping"...

oil grooves with cups/ ball oilers filled with proper way oil is your easiest fix. It'll fix your stiction problem in no time and help reduce future wear. I'd suggest doing the carriage too, where it sits on the ways. I'd personally suggest going with proper cups or oilers as that will make sure you actually use them. They're not that much for a one off, last a lifetime deal. I'd also suggest adding way wipers if your lathe doesn't have them - keeps the way oil in and the crud out.

Once you've got that sorted, then you can worry about scraping in the geometry, which is a much bigger task.
 
Gib is bowed approx. .008" outwards from the center of the slide, as Richard pointed out above.
Do I bother attempting to straighten it out?

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yes!!!

straddle the gib lengthwise between 2 parallels in your press and put the bow up.
the parallels should be near the ends for the best use of the force applied.
put a dial indicator on the gib high spot and zero the indicator
press to -.010" (you indicated a .008" bend, you'll go about .002" past) and let the gib return to it's natural state
recheck and then repeat as necessary
 
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