I have already contacted XYZ Support with a solution to this problem, but they don't seem to care much about it.

I did the bed levelling and that sorted the prints curling.

So I would suggest you try a bed level - yes its frustrating but it may help

Regards
Ian

"UHU stic" and "Purple Elmo's" both work very well for getting ABS to stick to a glass bed. I think the Purple Elmo's goes on a bit smoother, but they're both good. I've found it goes on better if you apply the glue stick when the bed is cold. There are likely other flavors of glue stick that will work, but of those I've tried, I know those ones will do the job. One word of caution, though, is glue sticks are NOT all the same. Some work great and some don't work at all.

For the ones that do work, the print just plain won't come loose until the bed temp drops below 50C. If your bed is level and is holding a temp around 100C to 115C for ABS, I'd suggest putting down a layer of glue stick to see if that cures the problem.

The corner pulling off from the bed "might" be able to be fixed by a combination of bed leveling, using slurry, and a wide brim to get the print solidly stuck to the bed so it simply can't pull off.  The other layer bond issue can be fixed by a hotter head, but shouldn't be necessary.

I will say this much from having tried other filaments, XYZ's is decent for not warping but it's layer adhesion is not very good. What I'm using at the moment is not very good on the warp aspect, but even at 195C the layers are stuck together better than  I ever saw with stock filament. So if the print is very difficult, you might want to try some other filament and see if that works for you.