You should really try to do the kaidomain 86mm reflector Courui D01 mod
LinusHofmann came up with it & it is just one of the most epic “cheap” massive thrower mods you can do.
I don’t know anything that beats it that we can build from scratch & it is a a proven design by FmC 
And the best part is you can reuse most of your really well modded Courui D01, and make it MUCH throwier 
If you upgrade the led to a XM-L2 U4 1C you get about a 7% improvement over the U3 you have now, or if you use the XP-G2 S4 you can get a bit higher still but with less lumens & spot size.
The XP-G2 S4 + 86mm reflector could almost double the possible kcd from what you have now.
If you get an extra mcpcb, you can drop in the XP-G2 for example, to see what you prefer.
And the UF-1405 or UF-1504 is a very fun & quick mod for a solid 400kcd in a aspheric lens light UF-1504 is easier because you can use normal FET drivers. The UF-1405 need 17mm high amp buck drivers & those are not available yet, but RMM will probably sell some in the future