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I would like to rank the site in Google.com, because it will receive 5 times the traffic, so would like to figure out this problem. Could my UK listing be due to too many UK backlinks, though my backlinks seem well diversified amongst English speaking countries.
G.com is always a tougher nut to crack, simply because the competiton is way more than five times the size.
Also, with new sites, serps should not be seen as permanent, anyway.
I'd just do what needs to be done for G.com listings, and be grateful for an enhanced UK audience while it lasts.