DJM A9 and 2 CDJ 1500X's Audio & Glitching Issues

Hi there,

I purchased a DJM A9 & 2 CDJ 1500X's which have been connected to an Acer Swift SFX14-72G via a powered TP-link hub using USB's. The 2 CDJ's and a DDJ-XP2 are connected to the hub and then to the laptop and the DJM A9 is connected directly to the laptop via a USB C. 

Since setting it up I am experiencing loads of glitches and sound cutting in and out. Done all the obvious stuff, sample rate check, increase buffer, turn off stems etc. But it's still pretty unusable. 

Is this the best way to wire the CDJ's, mixer and XP2 up or am I missing a better way of doing things. My FLX-10 used to run perfectly without any issues and since upgrading I am struggling to find a workable solution.

Should I be using DJ Link and a USB hub or connect the 2 CDJ's via ethernet. Any help or advice would be appreciated as I'm losing the will to live and as it's all Pioneer I'd hoped it would integrate without issue.

Thanks for an suggesteions.

JP