The layout doesn't appear to be very economical on speed after the low turn into the second Zero-G. I mean, on any old B&M yes it'd be absolutely dandy and this wouldn't be a problem, and I'm certain B&M done the right calculations but perhaps, like their trims, they and Six Flags are just testing the water because of how comparatively enormously heavy the Wing-Rider trains are - and X-Flight in particular is B&M's biggest and heaviest ever train. They probably want to see that it'll make it back to the station maintaining sufficient speed throughout (that inline is probably going to be slower than Raptor's, hence the downward incline to get the train through it and then the final helix, which in itself could easily kill any residual speed with such a heavy train). It's also possible that this is just a period of choosing the wheel material combination to decide which is the best to offer the most acceptable forces and speeds at different parts of the circuit.
But I'm no expert really. X-Flight is looking very good though.