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Yes your lvl compared to the mob's lvl does matter in drop rate.
This is a very common misconception. Square has said outright that this is not true. I don't have the link on me, but it was in an interview on the Warcry FFXI site. In my experience, the drop rate on skulls hasn't changed since I started helping with them at 30 to the last time I helped with one at 56.
As far as actually getting the drop goes, I'd say just track down friendly high level help to slaughter all of the ghouls in Gusgen for you. I'd be willing to help if I'm free, but I think my weekend is kinda booked. It looks like you have several other offers of help though, so you should be a-ok.