How much light? How long into flower? What pruning have you done throughout the grow and most recently? Do you think they are blocking light from potential bud sites? A third option is to tuck them. Sent from my Nexus 5 using Grasscity Forum mobile app
Once the leaves are completely yellow, it is fine to remove them. They are dying/dead by that point and serve no useful purpose. The plant has removed the nutrients from the leaf and the chlorophyll has broken down. If you are getting a lot of yellow leaves, you are likely over- or under-watering your plants. Granny