Don’t take this “U6-3A” too serious. That is the emitter that I’ve ordered, but you know… Chinese sellers write stuff in their description, but you might receive something else. But I don’t think you will get much more with only 2.8 A in the C8+ host with 8*7135. The C8+ has definitely the worst intensity in this comparison although it has the bigger reflector.
I think the KR1 W2 with 18350 tube is a really good EDC thrower.¹ 100 kcd, really small and 7.5 A should be fine with high capacity 18350. I use the KeepPower 18350 1200 mAh which can handle 10 A. And the capacity is more than enough because most often you’ll use a (EDC) thrower just for a short time.