If it were the other way around, I would blame the lps for spitting chemicals to discourage competition: they're good at that. But if your sps are doing better than the lps---and granted they're doing very well on an absolute scale, I'd say the light is probably better for the sps and the lps might want to be just a little lower in the tank...granted they are in the SAME light. i'd also be careful to put the lps where their water flows out without flowing across the lps.