Can you "fix" a bad top install?

To your original question. If you know any decent upholster you might just ask what they think, I did not do the 69 but I have installed a top on a 65, although slightly different in process what I can tell you is sometimes trying to fix something like that without experience can make it worse. But I also understand the want to do it yourself as I know a complete top and install is in the 1000 range for a decent job. I have a 68 service manual at home I will see if I can find any information for you this evening and post pictures of the pages.