Hi, Bri. Boy, I see problems. Tack strips on tack strips sounds like a sticky problem. One of the other reasons for renewing your carpet is to renew the padding, which loses resilliancy over time. Unless you are planning to tear out the old carpet and pad, replace the pad, relay the old carpet, then lay the new carpet, you will not get the benefit of new padding. If you want a softer feel to your carpet, then talk to your carpet store about heavy padding.