i am also running the pwk28's but i am ported at sea level with mods in sig. 45pilot 155main n68a needle all the way down.
i dont know what needle you have but i would recomend either the jjh or the n68a. probobly 45 pilot and 150 mains to start since you dont have porting. should be close but like some people do, a plug chop to confirm.