try using hi ratio shortening rather than crisco. Sweetex and Alpine are two brands. They can be purchased at cake supply stores. also, mix on low speed. If you have a kitchen aid use the paddle attachment rather than the wisk.
Also giving your frosting some rest time in the fridge might help smooth things out. I've always had airy frosting when it's fresh ,but after a sit in an airtight container in the fridge it was perfect. I just let it come back to a temp warm enough to mix and using a spatula/spoon mix sparingly. I mix it just enough to bring life back into the frosting.
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