Yep, one of the guys that works in a garage said that to have that many weights can be normal. It seems it depends on how the tyre seats itself on the rim. Although, he did say that if they were buckled there'd probably be alot more weight than that, over 100g or more would be of a concern.
He said it was nothing to worry about, as apparently Toyota wheels are really bad for this and he said he often puts alot of weight on them to get them to balance.
After driving it last night, it actually doesn't feel that bad. I'm just wondering if i just need to get used to the different "feel" of these wheels.