Answer: Small containers equal root bound plants and that equals stunted growth. I'd repot the palms using fresh potting soil. A yellowish color indicates stress, usually from lack of nutrients. I'd feed them with a half strength dilution of water soluable fertilizer (such as Miracle Gro) every 3-4 weeks. If they were planted in the ground, yellowing foliage could indicate a need for iron, but not if they are planted in containers. Plants in containers can overheat if placed in full sun. Their roots can actually bake - so that's why the ones in the shade are doing better. Hope this answers all your questions!
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