your best bet is to try get the high shock plates, they normally come with the low ones fitted. did you get a set with the frame/bike? if not id put a wanted thing on the buy sell section, im sure someone will have some. that should remedy the problem.
yea I think its possible to lower the domain but theres no point as I have a 160mm domain also I am just goin to put those on see if makes a difference
look at other photos of sx's with the same forks on and compair. It might just be cause your sitting on the seat and it makes it look like the h.a is slack.