The Osram leds are thowers indeed, so that may be a factor when looking at these comparisons.
You can check this thread (a bit longer) with some set ups I did some time ago, with carclo 10507, 10508 and 10511, with XP-G2 leds. Perhaps that can help you more: Essays with Triple TIR optics and XP-G2 Leds [PIC HEAVY!!!]
The LH351D, if compared to the Osram, will have less artifacts eventually, and will be more floody.
About the Kaidomain optic, I don’t have it to make a comparison, but being a “clear” lens, it will always have some artifacts, but will also throw a bit more light than a frosted/semifrosted lens.