I wouldn't go for a laptop if making fancy V-ray renderings is what you're after.

When you say “not doing so well” what do you mean?? Vray renderings can take forever and still look like garbage if you don’t know what you are doing.  I dont see anything wrong inherently with the specs. 

Yeah I'm curious to know what aspect is the comp not doing well in.  Those specs look really good, not gonna get much better for a laptop.  Maybe the screen hz can be improved, sometimes you can have the greatest graphics card but if your screen can't handle it then it's pretty much useless.  I think that might just be a visual thing though not a power house thing, which your laptop's specs are decent in.

The specs are fine. Gaming laptops are generally top-notched tools for architectural softwares.

So I'd delve deeper into the "why" isn't it doing well with your workflow/results.

It makes zero sense to go with a laptop these days when you can run an 1800x octa-core system with a 1070 ti and rip through v-ray and maxwell renderings.

Not even that HP Omen will compare to what a basic Ryzen system does.

Laptops are not great for high end realistic visualizations. Vray works in two ways. either you use RT for real time in which case you  need a graphics card with as many CUDA cores as you can afford or if doing a calculated render you need to fill it with as many CPU's and the fastest CPU's you can afford. basically, duel Xeon processors. which is why laptops won't really cut it as very few can handle xeons let alone two and even the ones that do need so much cooling that the laptop is a heavy beast that defeats the purpose of having it for mobility. 

as for graphics cards, gaming rigs are built for refresh rates and frame rates and do this by sacrificing color accuracy. MAX runs on direct X technology and autocad is Open-GL these are different so buy a card that works best with what you do most.