what brakes are you running?
HX wheels don't have the right offset for the larger EX brakes
yes, they are enkei wheels 14x5.5
a 14x6 wheel will give you slightly better handling and there are some out there that are in the same weight range as the HX's
I found a set of Ray's engineering 14x6's that came off a miata and weigh almost the same as the HX's