I'm also a very cold sleeper. Made a Fronkey version of a hammock sock. Works well at raising the inside temps by at least 10*. Normally sleep in tech type long underwear and a layer of thin fleece. Have been using a 40* UQ with a 20* TQ.
Next investment is 0* gear. Will also be refining the cold weather sock.
Love is blind. Marriage is an eye opener.