Not that I’ve noticed, generally fermentation is very close to FG by the end of dry hopping. Dry hopping at day 7 works just as fine, just more risk of oxidation
Ive found that building your hop schedule backwards for IPA’s works great. I second the dry hopping and with a bucket I would make the addition at maybe day 3 or 4. Reasoning is you don’t risk oxidation due to fermentation still being vigorous enough to expel any air that gets in.