No big deal. Nobody knows everything. There could be improvements I'm not aware of... but in that case I wouldn't be the one to ask
In theory the reflectors should help the cobs get about 98% of the light to the canopy so if there was an improvement available it would be very small.
I do gear my product toward the enthusiast level and have exhausted possible improvements I'm aware of. Those reflectors should be about as good as it gets. High efficiency drivers along with more aluminum, more surface area, and more fan power than necessary to squeeze out as many lumens per watt as possible and keep the lamps running cool.