I have a QH that I show in hunter classes...and I have my share of times where QH judges give me the gate...those are the judges that give "Arabs at open shows" a bad name.
I've seen an elite QH BREED judge give an ARAB grand champion in halter :)
Most of the people I've seen (PERSONALLY) with Arabs that grumble about judges not liking Arabs have either crappy Arabs or have horses that aren't 'broke.'
My advice to you: You have a well balanced, handsome horse. In halter classes, get him to arch his neck, as that will make the neck-chest attachment look better...
and as mentioned, get him to go like the breed standard would ;)
In riding classes, no matter what the show, he needs to be BROKE and consistent...that means: have a frame. Consistent with a nose up in the air, hollow back, quick falls isn't going to win ribbons, no matter what the breed.