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If your calibration and bed leveling are good, the Predator should print well from edge to edge. There are a few "quirks" of the Ultrabase bed that I have discovered over the years:
1) It's temperature from edge to edge is pretty inconsistent. Enclosing the printer helps alot. I use plastic panels that snap in to the vertical slots.
2) Depending on when you got your printer, the bed may not have been cleaned of manufacturing residue from the factory. I found that scrubbing the bed with hot water and dish detergent using a Magic Eraser, followed by a fresh water rinse, followed by an isopropyl alcohol rinse helped immensely. All kinds of residual crap came out of the "waffle pattern" on the bed.
3) I also found that the standard "paper test" for nozzle height is not close enough. The nozzle should barely skim the high points of the waffle pattern, so that it squeezes the first layer into the grooves in the pattern. If you can baby step down until the nozzle is almost, but not quite, actually scraping the bed it may help quite a lot. I usually run about 0.025 mm from the bed for the first layer, instead of the "standard" 0.1 mm.