I have had the X1 type base and I found if I got the Gibs set near enough used it a bit so it beds in and then check it you will fing it will nead nothing more than the gibs re setting if you start scraping bits at this stage when it beds in you will have to do it again, I would just bed it in , the bedways are ok when they leave the factory, just need a bit of setting the long bed ones magnify any bad gib setting I found as updated mine with an Arc long bed kit
Peter