In general the X and Y movements are quite well balanced.
Yes, the Y has two motors and two belts, but it also has twice the rolling resistance from twice as many V wheels. All other things being equal this results in fairly similar performance, on average, across the working area of the machine. There’s a lot more detail to it for those who are interested
If it was my machine, I’d back off the V Wheel tensions on X and Y, then re-tension them all until just the point where, with one finger, you can’t quite turn the lower V wheel. One finger, no gripping and twisting the V Wheel or it’s easy to reach backlash and broken V-Wheel inducing levels of pre-load.
As always, check the set-screws on the motor pulleys, after a while you can hear and feel the little ‘clonk’ as the pulley slips back and forth around the flat.