It would certainly be nice if Sam chimed in.
Rqs isn't even a breeder and has a very poor reputation in the Netherlands.
You can google translate what the experiences are if you wish:
https://www.jointjedraaien.nl/wietforum/threads/32277-Mijn-ervaring-met-Royal-queen-Seeds
Serious or MNS don't deserve to be compared to rqs.
16 Plants per m2 is the standard for commercial grows from cuttings and works great.
Plants from seeds get bigger though and this grow is not commercial.
As Bubble Gum blower and grower I can tell you 4 BG's from seed per square meter works great too.
One may be better as a grower, but the other is definitely better as a blower (= Dutch for smoker of cannabis and/or hash).
Personally I use a much longer vegging time and hang the bulbs closer, but I know very little about growing indoors.
One of the ways I cope with that is by using big 65l (17gal) containers with organic soil (some Allmix) and feeding very little if at all. For me growing in coco seems too much of a challenge but I am also lucky good soil isn't ridiculously expensive around here.
What I try to do most of all is as little as possible so at least the plants have stability.
I don't know how to fix any problems so they must and I try not to interfere with that.
It's an idiot proof system
A nice strain for you based on it's Hawaiian origin could be Spice.
May be you want to use less nutrients as well, because some actually increase THC at the expense of CBD.
THC helps against pain, but too much of it can have the opposite effect and cause anxiety too.