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Technically most sealed bearings don't need that much grease, too much = bearings start to skid around instead of roll, extra drag etc. However if there is space for water to get in, then it will and play havoc. Best thing for your bike is to move to south of France or Morrocco, anywhere drier than here).
There is a table somewhere about the type of grease (NLGI type 1 is best class type for UK riding IIRC, but most come with NLGI type 2, which is better for temps of +20-50c). Theres also a table for grease brand/type vs ambient temp vs usage, as the grease should warm from the friction and turn to oil during the bulk of the usage, if it doesn't then 1) extra friction 2) chance of balls sliding = uneven wear and pitting is likely.
BrickMan
ectoplasmosis
From the feel I think this is probably what's happened. I've emailed them and got this explanation, with an offer to return them for another set of they don't settle after a few rides, so that's that I'll try.
"The bearings used are high grease fill, SKF bearings which means they will appear a little tight to begin with. The seals used on the rear hub can cause some friction to begin with too, this means they keep more dirt etc out but both the seals and bearings will bed in after some use."