I have three Kenyan sand boas and wanted to introduce them

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Kenya, an extremely, extremely aggressive female (seriously goes way out of her way to bite me...she's about 3-4 years old and has done this since around her first birthday). First pic was when she was younger, second is still an old pic but more what she looks like now:
Second one is Gobi, a 2 year old male and a complete sweetheart. Sweetest snake I've ever met!
Third is a new baby that someone gave me. His name is Vulcan and he was rehomed because the owner went to college and the mom didn't mind caring for the other snakes but didn't like Vulcan. He's a problem shedder and problem feeder. He's a nervous little guy but we're working on it

. He's apparently 10 months old.