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L704 does not have a "top" its a single slug coil. I hope you were not adj T704 which is a transformer with a top and bottom.
did you make a video of the adj you were making with the fine tune? Not sure I understand when you say it makes not difference at all. do you mean nothing at all happens when you adj? as in the fine tuning is not working at all?
I hate to keep having to say this but without video of what is happening its hard to give good advise. Your descriptions will mean different things to different people, a picture is worth a 1000 words.
Perhaps the others on this forum are ok giving advise without seeing what is happening, Its just something I prefer not to do.
I will restate the last thing you should be doing is adjusting coils, I would do tube swaps in the color osc circuits 1st, often the osc tube is a problem.
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