If anything I would cut the two blades off the leaf that are affected, no need to take away the other blades, they will continue to absorb the light. Your plants are looking pretty good, the may be stretching a little, so I would say add more light if you can, try to keep your grow room under 90 degrees and you should be ok, I believe most growth stops when temperatures reach 90 due to the fact that the plant is using its energy to remain cool. Make sure your venting is adequate, the hotter it gets the more carbon dioxide your plant will need...