Competitor devices have usually not been compatible with XIM in the past with the exception of Titan 2, I wonder if others are using this successfully. Testing the mouse in another port on the hub or using a powered hub or adapter may help with stability if it's related to power. There's a chance it's due to a shorted mouse cable as well. If these suggestions do not help I recommend testing another brand of mouse.
If you would like to test against power there are two options. A powered hub can be used in place of the APEX hub, the hub would need to include it's own AC adapter. USB 2.0 hubs have official support but 3.0 hubs are reported by the community to work as well. The second option is to add a power adapter to APEX's hub. APEX supports power adapters using the spec below and can be found on amazon or ebay. To prevent damage to your peripherals do not use a power adapter that doesn't match this spec and do not use a power adapter with an adjustable voltage switch.
5V 3A power adapter ([3.5mm x 1.35mm], center-positive)