Issues with external display on hackintosh laptop

Hi guys !

I'm a newbie in the Hackintosh world, I just successfully installed Catalina on my Huawei Matebook 13.

I followed several guides and got all adapted kexts from here.

Everything works fine:
- BT ok
- Wifi ok with an adapter
- USB ok
- Sound ok (except jack 3.5, but idc)

On windows, I used to plug my laptop on my desktop monitors: Dell S24DG (1440p@165hz - via DP) & Generic Asus (1080p@60hz - via DP to HDMI cable).
As Matebook 2 only has 2 usb c connectors (one is for video but no charge, the other for charge but no video - both can handle data transfer), I had to have 2 usb c hubs. One dedicated to video cables (usb c to 2x DP) and the other to PD, usb 3 hub & Ethernet.

Except, now it doesn't work anymore on Mac OS.

What I was able to do successfully:
- Extended view on my main screen (dell) via HDMI
- Extended view on my main screen (dell) via DP: the screen turn up, but the cursor instantly freezes and then the screen turns black
- mirrored view on both screen: main monitor (dell) via HDMI, second monitor (acer) via VGA: both screen show same view, no point doing that.
- unfortunately, I limited in my tests buy the usb hubs I've got and I can't try dual HDMI

My laptop specs:
- i5 8265u : 4C/8T
- 8gb ram
- Intel HD 620
- Crucial P1 1TB SSD

As I said, I'm a real newbie in this world, I managed to get the laptop boot and work buy following instructions and getting the overall idea but not the technical part.

Would a kind soul tell me if this is a known issue, if there are some settings I could tweak or if this seems more due to my usb c hubs not being fully compatible with Mac (I checked, seems like it is on amazon's product page) ?

Ideally, I'd like to have my dell screen in DP (for 144+ hz, cause I play games via shadow pc sometimes) and the second monitor in usb.

Thanks in advance !
Cheers