IK Rig Issues

I’ve got 2 problems with the IK rig I’m currently working on that I can’t seem to resolve on my own.

Moving the rig’s pelvis bone down a short distance puts the rig into a crouching position like I want it to, but moving the bone further down causes the bone to rotate and tangle up the legs. Example:

I can’t seem to find a way to get the rig’s IK helper bones to maintain their positions/offsets in relation to the bones they’re supposed to help manipulate. Basically, I want the helper bones to move with the IK chain they’re attached to. Example:

Anyone know how I could fix these things?

Hi, keep the knee control bone a distance in front of the knee and make it a child of the pelvis control.