Since you are reporting that your CYA is 40, don't add any more CYA. Do not do the hang a sock in front of the return thing. Your CYA is already high enough. When you removed the CYA from the pool floor, I assume that you vacuumed it up which means it is now sitting in your filter dissolving and adding more CYA which you don't want. So, backwash your filter and get it out of there.

One other note --- remember that new members have to have their posts approved by a moderator before they appear on the forum. When you post, your post goes to a moderation queue to wait until one of the Pool Forum staff reads it and releases it from the queue. So, you will not see your posts immediately upon submitting them. Usually one of us in online most of the time, but sometimes there may be a couple of hours when none of us are. But, typically your post will be modded in within a couple of hours if not sooner.