Control Rig Spline Help

Hello! I have a snail character in my project and I have been trying to get the model to bend to fit against the ground like how a snail in real life would. I think a spline IK would be best for this but I keep running into issues because there isn’t much documentation or tutorials on the thing I’m trying to accomplish :frowning: . I’m having trouble even just getting the spline to work and it keeps doing this?:

Is it a problem with the rig or am I doing the blueprint wrong? Could someone please help me figure out how to do this?
Thanks in advance!