RR does not stack. It’s all for the conversion. Alternatively you can go for pack of treacherous means + 2x belgo rings but that’s not ideal becsuse of skill points.
As for numerical questions like how much damage boosts does this change do and such, I don’t exactly know. I mostly go on feels with my builds and while I can provide the numbers given some time, I prefer not to.
Anyway, if you play without GDstash use will of thr blade on the amulet before you get the kaisan one. It’s just as good as the green.
I’ve played cruci since AoM release and there has been a lot of changes that affected what the normal times would be. During 170 release it was the DA meta where just clearing 170 is the norm for builds except those who were DA stacking, since those can actually farm cruci. Later on it looked like 12 mins was the norm but it was later discovered that it was only because the most prolific builders at the time had shit pc. I still remember my best builds getting only 9 min clears but then people would play it and get sub-6. Then the godlike pilots came along with minor qol patches that means a lot to those pilots. The recent aggro fix really helped a lot too. I had a build that was 5:30 before 188.8.131.52, it straight up got nerfed and it was still clearing at the same speed after patch before I made any reworks. 184.108.40.206 and I was getting consistent sub-5 runs until nadaan went RIP and I have to rework it again