I’ve got one of those 8A driver for testing, it does only ~7A above 4Vin, 5.5A under that, with the cell voltage sag it’ll basically never do 7A. Maybe mine is a dud but anyway 8.25A is excessive for the MP3431 used in this driver, and if you don’t see a difference in output vs 5A 90CRI then 5.5A makes sense.
Aside from that, you’re very lucky with that tint, I think @Haukkeli tested a few 95cri from kaido and they weren’t that good.